Apple is getting people together for yet another invitation-only press event next week to announce "Apple’s latest pro innovations". This is only one week after the "One more thing..." event which took place two days ago, where Apple announced new consumer products and services: iMacs, video-capable iPods, and a video download store.
If we don't see new Power Macs (quad G5 that is, with PCIe and DDR2) and PowerBooks, I'll eat my hat. We shall see in a few days, but in the meantime I'm off to look up some hat recipes.
The Apple Store now states the 15" & 17" PowerBooks and all the Power Macs will take 3-5 business days after purchase before they are shipped. Such increases in shipping times for stock configurations of Macs are often a sign of imminent updates.