And besides all this, correct me if im wrong, but last i heard was that gow used only 30% of the xbox 360 max capacity, running on only two threads (of the six available) And not using the max capacity of the GPU.
So why would it need two dev kits to run on?
I wanna bet that in the end of this 360 cycle the games will at least look twice as gorgeous. All because of optimized rendering/ advanced shading. In hl2 the walls were for example by using advanced render/shading techniques very low poly but looked super high poly. This will happen when even more advanced modeling emerges coming years. When unr 3 engine looks incredible now.. It will be surpassed by other engines in the next years. And my guess is that the x360 is more than capable of handling it. Because of optimization for the system.