frankly as far as WWDC goes i don't think they can spend an hour and a half on tiger, hell they shouldn't talk anything other than its adoption, we've seen three keynotes on tiger already, we got it, we know the new stuff, there's no need unless they show developer examples or something, we know what apple can do.
as with the recent powermac update, only 200mhz? seems kind of fishy and makes me wonder if something better will be announced, a more high end version of the powermac that will ship in the fall or later summer.
just my two cents.