I didnt read the whole thread, but this is a collection of knowledge i've picked up.
• Everyone is pissed, and rightfully so
• The delay could be 1 of 2 things, or both.
1: Sony wanted to include the new firmware on the disc to slow down piracy, and this pushes it into the next production cycle.
2: Yamauichi said that during certain times in the game, like during weather changes or crazy wrecks, the frame rate drops a little less than 60fps and he doesnt like that at all. He might need a few more days to fix it, which once again pushes it into the next production cycle
• SCEA didnt say much, but SCEE said it will be out by christmas
As far as Forza, it doesnt have half the stuff GT5 will. Iirc (i havent spent much time in Forza 3 since my DFGT wont work on my 360), Forza doesnt have snow, night racing, near as many cars, 1080p native... You get a lot more Forza games, but none of them really have as much going for them as one copy of GT.