Well... Lets start with some IF...

IF new 991 GT2 engine is based on new GT3 engine then it will have true dry sump and will use pretty unique new turbo chargers(guess the number of chargers 2 or 3 ?).

IF new 991 GT2 will use PDK-S from new GT3 then 7th gear will be used as power gear and new GT2 will achieve more then 330km/h top speed in 7th gear. Acceleration will be despite RWD only(but with even more capable electronically controlled rear diff) will be mind blowing. Read faster then both MP4-12C and F12 Berlinetta.

IF new 991 GT2 really gets new engine(with true dry sump), PDK-S, RWS etc then projected price od 220K € in Germany wont be too much(for a car capable Ring time of below 7.20min).

BTW, check the pics again-there is a clue what engine is in it...