Using the GPU for general processing is pointless when the game doesn't take full usage of the CPU.
BI should focus on current CPU technology (64Bit, Multi-Threading). From the comments I have read, it seems that people believe the game is CPU bound - did you miss where the reviewer pointed out he was using a top of the line $1000 CPU?
The game isn't CPU bound - it's bound by the technology behind the engine, not the hardware.