TheVerge thinks:

With its own engineering pedigree and a lens ecosystem that should grow faster than anyone else’s, Panasonic is making all the right moves to catch up with the likes of Sony, the undeniable leader in popularizing the full-frame mirrorless format.

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Lensvid interviewed the Sigma CEO and here are some key info:

• Sigma was working on their own mirrorless full frame camera for several years (with their own mount). However around 2015-2016 Panasonic suggested to Sigma to join forces and create a joint full frame alliance which was joined by Leica (when exactly Leica Joined is unclear) and the Leica L-mount (used on the SL cameras) was chosen for this new partnership.
• Sigma will make both lenses and cameras with this mount (and will develop new FF Foveon sensor) for their camera which will be available sometime in 2019.
• Panasonic, Sigma and Leica do not exchange information about future products but they do work on improve the L-mount and make sure future products will be compatible across the system.
• The new system is currently only for the three companies (this isn’t an open system like micro 4/3 for example), but Mr. Kazuto Yamaki stated that he is not ruling out adding more companies in the future.
• Some Sigma users asked the company for tilt-shift lenses for mirrorless cameras but this is not a priority for Sigma at the moment (as this is a niche area and the company has a lot of more urgent things on its plate).
• Sigma always tries to make its lenses smaller and lighter but at least in the art series, it prefers optical performance over size/weight as opposed to the contemporary series which is more balanced.
• Next year Sigma will start making dedicated mirrorless lenses (we are assuming the intention here is full frame lenses since Sigma already has a very nice APS-C dedicated FF mirrorless line).
• These new lenses will be smaller but not by much. Mr. Kazuto Yamaki gives an example of Sony’s 35mm FF lens vs. their own DSLR lens with an adaptor and explains that making the lenses significantly smaller might not always be possible even if they are designed for mirrorless cameras from the ground up.
• Sigma is interested in Phase Fresnel but this doesn’t mean that we will see any lens based on this technology (which Nikon and to some extent Canon) employed.
• Mr. Kazuto Yamaki agrees that we are at the start of a new area in Photography, one that signifies the move from DSLR to mirrorless cameras. He also mentioned that he believes this is part of a process of change that has been going on for a long time and has been happening every 20-30 years. The last time was the move from analog to digital, before that we had the move from manual focus to autofocus and even before that the move from rangefinder to DSLR cameras.
• Mr. Kazuto Yamaki predicts that we will see more mirrorless sales than DSLRs in about 3 years. However, DSLR lens sales will probably still be higher (as there will still be many more DSLRs around compared to mirrorless cameras).

There are still companies that have not joined the Full Frame mirrorless world or have yet to commit on making L-mount lenses.

I can see Ricoh-Pentax trying to get on board while Olympus may join some times later too. Zeiss and Voigtlander L-mount lenses would be very welcome too!
An unexpected but surely very strong partner would be Samsung with their excellent sensor tech.

So let us know:

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Share in the comment system why you think a certain company would be better than the others…

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You can join the new L Full Frame Facebook group if you plan to buy this camera. There you can discuss all features and tests once it’s released!

To readers: While I am working to get some early specs I kindly invite you to stay tuned on L-rumors by subscribing here:
RSS feed: http://www.L-rumors.com/feed/
Facebook: https://www.facebook.com/L-rumors-266550040642592/
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Sony just updated their sensor database which now includes a new Full Frame IMX410 sensor. I see it likely that this is the sensor used by the Panasonic S1:

Lensvid posted their video Interview with Panasonic. That one curious tidbit is that the 70-200mm lens displayed at Photokina was just a 3D printed mockup with no lens inside. Just look at the image on top 🙂

Personal View interviewed Panasonic at Photokina and here is the part related to their new L-mount venture:

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PV: Talking about new L-mount alliance among Leica, Panasonic and Sigma. There is one company I was expected to see and surprised to not see, Olympus. I know that Olympus and Panasonic, although these are two quite different teams with two different visions, have a long established alliance within the MFT system. Do you think in the future Olympus might come to join the L-mount? The partnership with Olympus may perhaps also benefit the L-mount system as it did with the MFT.

Mr. Uematsu: About the MFT standard. The standard means that we have fixed about the interface between a lens and camera body, and also the optical image circle and flange back. However, we never make any discussion with Olympus about the products itself. For the MFT we only have an agreement about the lens mount, without discussing specifics of our products. This could possibly lead to competition between our products. Therefore you may find almost the same specs lenses made by Panasonic and Olympus. If we can make any good discussion, we can make very good balance among products of two companies. But it is strictly prohibited by antitrust law. For the L-mount alliance, the licenser is Leica, Panasonic and also Sigma are just licensee.

Ms. Fujiwara: We have no information which other companies will get the license for L-mount as Leica owns the license. This will be the Leica’s decision to which other companies to offer the license for the L-mount.

PV: It would be interesting to know in this respect your opinion on the future of sensor technology. As you mentioned there was a large progress in digital image sensors in the last 10 years. How do you see the future in this field? For example, do you think we have reached the limits of the CMOS sensors and we really need something else? For example, I have seen the publications about the collaboration between Panasonic’s sensor division and FujiFilm developing organic sensors. I am certain there are other efforts.

Mr. Uematsu: As you know, since its initial announcement in 2016, there is a continuous cooperation between Panasonic and FujiFilm in development of the organic sensor technology. The recent results are very promising. The mass production of this kind of sensor, however, will take a little bit more time, and today I cannot say when we can use this kind of a sensor.

PV: Will Panasonic continue with development of sensors?

Mr. Uematsu: Yes of course. But even with the silicon photodiode, we still have some margin to be improved. The reason is for this is when more than 10 years ago in compact camera category many people said that pixels of a 3 micron in size is near the limits and any smaller sensor pixel would produce images of very bad quality, but nowadays the sensor pixels are 1.5 microns or less and we can get good picture quality, and this means that even with the silicon sensors we still have margins to be improved.

PV: However, wouldn’t the further decrease of pixel size bring us to the physical limit when the pixel size will be close to the wavelength of visible light? I am aware about the different kind of ideas, but I hope you perhaps could tell us your personal view on the possible future with sensor technology?

Mr. Uematsu: Of course, we do not want to reduce the sensor pixel size infinitely. However, each sensor pixel consists partially of a photodiode, a substrate and also of a transistor. If we can increase the relative ratio of the photodiode relative to two other parts, this will make sensor more efficient and also result in the better image quality. The reason why an organic photoconductive film makes better efficiency is because this allows to maximize the light reception area and more angle of the incident light. The organic sensor has less deflection. This means that the organic sensor can get more efficiency/sensitivity. This theoretically could make the organic film sensor better.