Originally posted by Yours Truly (Who Else?)
(1) Apple will use the low-powered Apollo G4 chip in their new Powerbooks. The slower of the two models will have up to a 733MHz G4, and the top model will have up to 867MHz. Apple does not want to push the envelope so far on processor speeds, because Apple does not want to kill PowerMac sales.
(2) According to some very reasonable rumors, the new Powerbook will have a higher resolution screen, of 1536 by 1024 pixels. The screen size will not change.
(3) Apple will keep the 133MHz system bus and plain old Firewire 1. I find this logical because Apple usually focuses on PowerMac sales, where they can get big bucks. So Apple usually puts any new and impressive features (Firewire 2, USB 2, 10/100/1000 Base-T Ethernet) in the PowerMac first, before Apple descends these features into the iMac and the Powerbook.
(4) Apple may add some sort of darker, more metallic color-coating on the Titanium skin of the Powerbook, according to popular rumors.
(5) Apple usually updates their line of products every so often, and the current 667MHz version is starting to "age".
-LW