This is new ifo about the 05 GTO from a reputable dealer:

2005 GTO
LS2 400HP/395TQ
Duel snorkel hood for increased engine cooling
Bigger brakes w/RED GTO engraved calipers
18in Wheel option
Split rear exhaust
Revised gauges with higher redline tach
Dead pedal

2 new colors Midnight Blue and Cyclone grey

Still not worth the money. Im sure with the new options and upgrades, comes a bigger price tag.