OK, here is more (rumors from one source only):
- 700 hp power is not final, could be slightly less or slightly more (not likely though). Latest number was 670 hp. 
- Top speed 340 kph
- Weight 1495 kg (not sure if this is DIN or whatever)
- 0 to 100 kph in 2.9 seconds (warm tires)
- engine apparently a highly modified 911 Turbo engine, incl. VTG(!) chargers
- RWS standard
- car will be limited production but final number hasn't been decided yet (apparently it will happen based on pre-orders) and apparently car is not already sold out, simply because the final number of how many cars will be produced hasn't been decided upon yet
- Price tag not under 250k EUR for the base model
- no manual (that was pretty much clear)
- very fuel efficient, not much higher fuel consumption than current Turbo S
- exhaust sound nice at idle/start, not so nice at lower rpm (according to someone who heard the car), nice scream at higher rpm but overall a bit disappointing (similar to 991 Turbo S but with a slightly higher pitch in screaming, thus maybe sounding a tiny bit louder). There also seems to be a pop-off/whining sound from the turbos (but this could be gone in the final product...hopefully not according to source).
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RC (Germany) - Rennteam Editor Porsche 991 Carrera 4 GTS Cabriolet (2015), Porsche Cayenne S Diesel (2017), Audi R8 V10 Plus (2016), Mini JCW (2015)
..
(see what I did here? 
for sure if it the same price like exhaust...
