here's my prediction based solely on rumors and hearsay: Apple will release new iPads in the Fall in time for christmas. the iPad will feature the new IGZO display by Sharp (thus sticking it to Samsung), will be much, much lighter, consume less battery, and maybe an even higher res. the mini will also get a high res IGZO display, and maybe a better processor but not as fast as the bigger iPad.
Looking into the IGZO technology, it gels with Cook's comment about amazing new hardware for the Fall. Really, it's what many people have been asking for - super low power high res that makes devices light-weight.
I think WWDC is going to be mostly software (maybe spec bumps for laptops/desktops) with Ive showing off a much needed UI refresh to IOS. Mac OS is not going to wow anyone as Apple sets their sights for a mobile/post-pc world. No TVs either this year. If Apple is smart, they'll stay out of it until the industry is as desperate as the music industry was. Calling it.