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Hi Ricky. thanks for those. The car is pretty much ready to unveil!

Of interest you can see the Turbo is sporting what appears to be a new front and rear caliper design over the 991 fixed bridge Brembo units. The openings at the rear of the caliper appear larger for better ventilation. I imagine the design is still very stiff but hopefully will be lighter and easier for pad changes than the current design. Also of interest (although it may just be an optical illusion) it appears the front PCCM rotor has a smaller bell housing allowing a larger swept rotor area. This would mean larger pads for more effective braking/cooling and better life. I have the 991.2 Gt3 with PCCB so have studied the pictures closely against my set up. The outside diamter of the rotors appears the same but the inside looks smaller. Such a brake set up will no doubt be offered on the new 992 GT3 and I would expect the steel set up to hopefully benefit from the same caliper upgrade. Of course we wont know for sure until the Turbo is formally launched n the next few months...
 

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A quick summary on a few deatils of the upcoming 992 GT3 that we know, and some that we can be fairly confident will happen from what we have seen on the prototype cars or heard from PAG official sources:

Wider front and rear track
20" front and 21" rear wheels
New Wheel design (Center lock)
255/35/R20 and 305/30R21 tyres in new Cup2 formulation
Likely new larger/improved brake rotor and caliper hardware
New interior
"Goose Neck" rear aero blade (adjustable)
Improved diffuser with depper larger rear fin exits
Improved RWS and EPAS
Revised shocks and PASM calibration

Engine capacity likely 4.0L with 6 x ITB set up from Speedster and GPF (estimated 520PS and 346lbft)
PDK likely 7 speed from 991 gen
6 Speed manual
Possible composite hood
Alluminium rear fenders

NurburgRing estimates we have heard are low 7s with factory supplied Cup2 tyres...

All that is left now if for them to design an entirely new folding/fixed bucket seat and it will be basically an all new package!
 

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Seeing the Taycan sure does help with 992 information. At least design wise. Both models, like other new Porsche's, share the new tail light design. ;)
 

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Heres the new 10 piston front caliper and larger PCCB on the 992 Turbo. I expect we will get this on the 992 GT3 along with the 355/35/R20 and 315/30R21 tire sizes...
 

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Discussion Starter #25
Although Porsche has still kept quiet about the new 992 GT3, coverage of development versions going around sure helps and this is one of them...

 

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Adding to @Macca's info, this is some other GT3 info we can depend on:
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2021 Porsche 911 GT3 Will Still Have a Naturally Aspirated Shriek
The 992-generation GT3, which we spied at the Nürburgring, will have a 4.0-liter flat-six and possibly an optional manual transmission.
  • We spied the 2021 Porsche 911 GT3 testing at the Nürburgring and now have a closer look at its exterior details.
  • We're getting a closer look at its dual hood vents, center-lock wheels, rear diffuser, and dual center-exit exhaust tips.
  • The new GT3 will be powered by a naturally aspirated 4.0-liter flat-six.
High-revving, naturally aspirated Porsches excite us. When we tested a manual-equipped 991-generation 911 GT3 in 2018, we said that "it delivers a driving experience so glorious that we can't help but wonder if it is a great Porsche or perhaps the greatest Porsche." We might have to re-evaluate our choice of words soon, because the 992-generation GT3 might be even better.

We've spied the 992-generation GT3 testing on the Nürburgring before, and we've seen a brief sneak peek in Porsche's 2020 Super Bowl ad. Here, we're getting an even closer look at the new GT3's looks. Its hood has dual hood vents, the center-lock wheels are similar to the ones we saw in the Super Bowl ad, the rear diffuser looks more production-ready, and the dual center-exit exhaust tips are still there. This prototype has a fixed rear wing, like previous GT3s, but it's unlikely that the production GT3's wing will look like this. As for the ducktail spoiler, we hope that stays.

We expect that the 992-generation will be powered by Porsche's high-revving, naturally aspirated 4.0-liter flat-six. In the 991 GT3, it produced 500 horsepower, while the hard-core GT3 RS spun out 520 horsepower. The 992 GT3, however, should get a slight bump in power. The six-speed manual, recently introduced for the 992 should be an available with a PDK dual-clutch automatic as an option.

We've already seen and driven the 640-hp 991 Turbo S and Turbo S Cabriolet. Expect the 992-generation GT3 to make its debut sometime late this year, and a race-ready GT3 RS version will surely follow. Pricing is expected to remain close to the 991.2 GT3's $144,650 base price.

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