MWSF = Radically Cheap Consumer devices
While I'm not saying the PB G5 will come about soon, I think people under estimate how RADICAL Apple's announcements were at MWSF.
The shift to a sub-$500 computer, and a $99 iPod were a MAJOR change for a company that always said you had to pay for design, and I think Apple wanted ALL the press to focus on this new approach to low end consumer devices.
It flies in the face of the most successful approach to building computers, the Dell "customized" approached. Apple has decided that low end computers now have more in common with VCR's (mass produce them with little modifications) than with a BTO approach. I think they are right, and at least at this low end the computer market might have come full circle back to huge runs of identical machines at an Asian factory.
Even if (a big if) they were to soon be releasing a PB G5, that's for the Mac faithful, and these people will soon find out about it, whenever it's released.