Looks like some exciting stuff coming from IBM, but at this point you would be more likely to see an Apple with a Pentium 4 then one of these processors.
My guess is Steve is waiting for Intel to release new technology. If it does not come in the next year to 18 month from Intel, Steve will still use whatever they have because x86 is Apple's focus now. So it is MUCH more likely to get a Pentium 4 then one of these upgraded G5's.
I don't even know why the rumor sites even discuss the PowerPC anymore. Steve said it himself...x86 is a much more modern and very simple processor. PowerPC is old technology that won't clock very fast. The fact is that even a Pentium 4 would beat these dual core G5's.
I still like the G5 and defended it for a long time and got tired of people going off on me around this place, so now I will just agree with them.