Widescreen 12" and 14", both at 1280 x 800 resolution
One main reason for the widescreen speculation is the unusual length of time since the last iBook update - so, rumor sites speculate a new form factor.
At $999 and $1299 price points, I think we're looking at 12" and 14" widescreen (1280x800) formats, with combo drives (Superdrive BTO only)
Yes, there are plenty of PC notebooks out there using those resolution LCDs (they're not anything Apple would have to special order)
Hard drives: 40GB on the 12", 60GB for the 14" (still 4200RPM)
Don't have a clue as to the video chip - whatever is the next step up, it will be that (as long as it is no better than what is currently in the Powerbook)
I am afraid, as so many have posted, even with 512MB standard, that we will still be stuck with only 256MB on the mainboard (so most of us will be immediately tossing 256MB of RAM)