I think ThePerm is right about N64. It was definitely September.
They showed quite a bit of new media at TGS, but I've heard that the demo version of DOA 4 that was shown to the press was only 50% complete! It's likely that the "in progress" version is a little further along than that, but for the demo version to be 50% complete with only two months until launch is terrible. There's also no new info on Perfect Dark 0, I smell a delay.
I think Microsoft may be looking at a DS-style launch, which is probably fine for North America, but I think it's going to really hurt them in Japan and possibly in Europe. There is one RPG in the works that looks like it might be quite far along, but if it's not ready for launch day in Japan, I think the system is going to look pretty boring and "American" over there. Not the impression MS needs to make.