The game looks amazing! Insomniac is very impressive, they have nearly ported their entire engine to the Cell's SPEs already (faster than I thought would happen), I think this game will differentiate the PS3 from any other platform available.
"Propriety game systems are now being heavily farmed out to the PS3's SPUs, keeping the central PPU as a sort of traffic cop that organizes what gets attention at any given moment. In simple terms, the game is taking much better advantage of the untapped potential of the console. In regard to visuals, the expanded use of the SPUs means more enemies on screen, significantly more complex AI from all of those foes and dramatically expanded options for special effects."
Source: Game Informer