Three CPUs would be as insane as XBOX1. There really is no-way to sell it profitably.
IMHO: it is more likely that M$ is getting a special version of G5 core, like celeron of intel, and putting three of those cores on a single die. Also the reality could just mean that the XBOX2 is capable of running three simultaneous threads on the single (but improved) G5 CPU (it is public knowledge that the next generation of PPC9xx will have multithreading).
And the rest is marketing & FUD.
