"Dead Rising 2 is not even announced for the Wii."
That doesn't mean they won't port it, especially if this makes money.
And making an engine for the ground up wouldn't make the graphics that much better. Monster Hunter does not have loads of enemies all active at once.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs








