I agree -- a G5 PowerBook right now would be nice also, but, I'm sticking to believing Apple at this point. It took them more than a year to get the G4 into a PowerBook, and the G5 is a much different processor with different cooling needs. My first-generation G4's heat sink can fit in the palm of my hand with room to spare -- not so with the G5, whose heat sink and cooling requirements are just too great to stick it in a PowerBook at this point. Plus, if Apple plans on keeping the very slim profile of the PowerBook, it may be the end of NEXT year that we see a G5 in a PowerBook.
We can hope and dream, but we always get slapped in the face by reality. It's like hoping we'll have magnetic levitation or affordable fuel cell cars by the end of December. Just a smidgeon outside the boundaries of reality, but forseeable in the future.