I already picked it up!
It was already on the Apple Store shelves here in San Diego, Thursday afternoon! Walked in, there they were, sitting next to the cash registers. I didn't even ask any questions. Picked up a couple of boxes and bought them -- didn't want to lose my chance.
Remember one thing -- you need AT LEAST 4.3 GB free on your boot partition to burn DVD-Rs in the Finder or iDVD .. I'm going through a painful process of backing up stuff and resizing my partitions. UGH. Permissions problems up the yin yang. Gotta reinstall everything. My wife's iBook install went fine (single partition disk) and she's happily playing with iPhoto and iMovie.