In an article [1], posted some minutes ago, ThinkSecret [2] confirms, once again, that Apple will release speed-bumped PowerBooks tomorrow, during the MacWorld Expo opening keynote.

The site predicts a speed bump to 1.5 and 1.67Ghz, improved graphic chips as well as Bluetooth 2.0 specificaton support. Our sources had predicted, two days ago, similar information about the processors and the graphic chips of the forthcoming PowerBooks, on this report [3]