It's only a year away.. maybe a bit more.. not that long of a wait. It's pretty much what I had figured, though, since it isn't easy throwing a G5 processor into a Powerbook with the heat issue still unaccounted for.
I sorta had a feeling there was at least one more G4 revision or speed-bump for the Powerbooks. Apple always did say don't expect a G5 Powerbook soon. Looks like there may have to be 1 or 2 G4 revisions now, before we see a G5 powerbook.