With both the Playstation 3 and the new XBox using PowerPC (or POWER-derived) chips, wouldn't you think staying with PowerPC is a pretty safe bet for now.
Anyway, what I wanted to say is... All the stories are missing the obvious: iPod's are using ARM processors. Maybe Apple wants to use Intel processors for them instead. Intel makes the XScale MIPS processors used in some Palm devices, cell phones, GPSes etc.
update: mariuz points out (thanks!) in the comments that XScale aren't MIPS but ARM (like the CPUs they use in the iPods now.