>> "the announcement at WWDC of a product with no release-date"

If you're referencing the Mac Pro, that one made sense to me. People have been complaining about the lack of an update for a long time and Apple was probably losing people to Hackintosh/other platforms. An announcement helps slow that loss. Also developers are likely one of the main groups the Mac Pro is relevant to so it makes sense to announce that they are working on it at WWDC. Also didn't they say 'later this year'? That's not too different that what they do every year with iOS (coming this fall).