Most demos are old. Remember Frontline? Buggy as hell.. Lots of framedrops, draw in, buggy animations, textures that flickered ect.
The Ratchet and Clank demo that was sent out to the press is also old.. There was a newer demo present at E3.
GT3 demo was old compared to what was available for the press at that time.
TOCA is probably a old demo too..
Im not holding my breath though. Ive looked at several videos from Codemasters site and the physics looks really weird.
Nothing comes close to Gran Turismo anyways

Great use of lightning 