G5-class Powerbook: not happening -- ever
With the Intel switch now a sure thing, it's obvious why Powerbook 7,1 and Powerbook 7,2 disappeared from OS X. The project was obviously cancelled. So if you want a really fast Powerbook, it looks like next summer will be your best bet, with a Powerbook based on Yonah likely to appear. Before Apple phases out the Powerbook G4, I expect it to be updated with Motorola's MPC7448, maybe two revisions, and that's it. The 7448 is a drop-in replacement, and, with a little tweaking, the Powerbook's bus speed might be raised to 200Mhz.
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There is plenty others threads relating this fact.
Sorry but this one is closed.