That would be a nice move, the new Tiger OS just makes it that much more sweet! My wife has an iBook and it is great. The Powerbooks are also quite awesome.
Already ordered mine so that I'd get it on release day.
I'm stoked. I didn't move from 10.2 to 10.3 so the new features are just fantastic for me ... plus the stuff I was missing from 10.3 of course.
I'm actually interested in Dashboard/Widgets, the new xcode2 environment, and that fact that AppleScript looks like its getting a fully compliant XML addition.
Of course I'm sure I can find more to love about it