If Nvidia has taught me anything about the g80 launch, it's not to trust what they say they're gonna do or how they will do it with regard to upcoming products. All this time they've been downplaying the importance of unified shaders and HDR+AA, while working hard to implement exactly those features. So if Jen-Hsun says he's not working on a cpu, you can bet your @$$ he really is working on a cpu.
Also, I dont expect NV to pull any magic tricks for the r600 launch, like moving to a 512 bit bus or adding extra shaders. If the g70-g71 transition has shown me anything, it's that Nv will try to maximize profit margins, even if it means giving up some performance/features lead to the competition. They can probably make up the difference in marketing anyways. And face it, the r580 was and is faster than the single-gpu g71 cards, it's not as dead even as some people would like to make it seem. There were rumors and expectations that a 32-pipe monster g71 would crush the competition, but I said it wouldn't happen, it did not happen, and I'm saying the same thing will not happen this time either.
What's more interesting is that we still don't know how the g80 performs in DX10 games, and maybe it wont even matter since the games just keep getting pushed back, but that certainly remains one aspect of the card about which we do not know anything.