Pre-announce at WWDC seems questionable
I don't think Apple would announce or show new PPC970-based Macs at WWDC and then wait a month or more before they actually ship. This isn't going to be a simple speed bump or change in appearance. When the PPC970 __is__ announced it will immediately make obsolete every G4-based PowerMac that is still unsold or on store shelves. Thus, I don't expect any PPC970 announcements from Apple until they are actually very, very close to ship (one week would probably be "stretching" it).
In any case, I'm not expecting any PPC970-based Macs until late summer or early fall (at the best).
I don't think Apple would announce or show new PPC970-based Macs at WWDC and then wait a month or more before they actually ship. This isn't going to be a simple speed bump or change in appearance. When the PPC970 __is__ announced it will immediately make obsolete every G4-based PowerMac that is still unsold or on store shelves. Thus, I don't expect any PPC970 announcements from Apple until they are actually very, very close to ship (one week would probably be "stretching" it).
In any case, I'm not expecting any PPC970-based Macs until late summer or early fall (at the best).