Bitmap Frogs on 28 November 2008
GT5p renders at 1280x1080 which is NOT 1080p. The console upscales it horizontally to achieve the 1920x1080 output resolution.
As for God of War 3 being rumored to be 1080p, it'll be just like MGS4, Lair and the slew of titles that were rumored to run at 1080p native... aka it won't.