I have been thinking about what Apple might do for while. My thoughts/deams
CPU: nahalem (any speed)
the internal memory controler it just huge and they will probably put the server version in to allow all cores to talk to each other directly
Memory: DDR3
any fast memory will do
GPU: Nvidia 260 at least hoping on 280. Please Apple, ditch ATI as they are a substandard part in both quality and power.
Case: probably the same
the MP case so just so amazing in design, how could top it?
As I have been following Apple for a while it seems that they only upgrade if it is sizable. the new micor architecture for i7 warrants a new MP. when it comes out I will have to look into it. I have had my MP for less than I year but coming from a PC background I am always looking to upgrade