I had to close the old thread since there were already too many posts.
You can find the old 997 GT2 thread here: http://www.rennteam.com/showflat.php?Cat=0&Number=224451&an=0&page=0#224451

New semi-official info provided by one of our valued Users and confirmed by our sources:

997 GT2
530 HP
PSM incl. TC
PASM
Top speed 204 mph (326 kph)
Price tag aprox. 4000-6000 Euro over the price tag of the 996 GT2.

Weight around 130-150 kg lighter than the 997 Turbo.
'Larger' VTG chargers with improved geometry (whatever this means).
No overboost function but launch control.
Apparently no sequantial shifting system yet.
0-100 kph performance: 3.6 s
0-200 kph performance: aprox. 11 s
0-300 kph performance: aprox. 35 s

Now lets the 997 GT2 rumour mill roll...