It looks like all of the rumor sites were wrong for a change. They were all predicting that Apple would announce the MacBook non-Pro, a replacement for the iBook. There were no Apple hardware announcements today. Furthermore, I have proof that G4 iBooks were still being manufactured as recently as last month.
I’ve been dealing with a large school deployment of iBooks. Just for fun, I ran a few of the serial numbers through this Mac serial number decoder. The results told that those machines were manufactured in April 2006.