If Apple doesn't update the Mac Pro website to say "Includes Mac OS X 10.5" (like it says under all the other Macs) tomorrow, that means we might see a new Mac Pro on Tuesday. After all, they wouldn't want the site to say Tiger for a long time. Also, Apple got the iMac chips 2 weeks before they got released from Intel, I don't see why they couldn't get the Penryns 2 weeks earlier (Tuesday)
~Matt
~Matt