I am excited to hear about widescreen iBooks. I just hope Apple does not do something silly like take out FireWire.
The trouble with this rumour concerns the PowerBook. I can't see Apple releasing a, x86 15" PowerBook and then waiting for a few months to release a 17" version. Would anyone buy a G4 17" while another x86 Powerbook is available?
As for the thinner design, it sounds like form has taken over function at Apple. The 5G iPod was also made thinner and that resulted in loss of FireWire. What will go in the next PowerBooks? The back-lit keyboards maybe?