Apple has never shown itself to have the wherewithal to correctly interface with game development, and I doubt they have any appetite for doing so. They're already doing gangbusters on iOS without any particular help offered, but the market realities of consoles (and, to a certain extent, PCs) are very different.

Microsoft's huge win on both PC and Xbox has been their active and aggressive devrel for games, which was where Sony stumbled hard on the PS3 (Cell processor development difficulty abound).