Hmm -- a pattern is converging, with many in the press and blogosphere expecting the 3G iPhone, expanded movie rentals, and an Apple TV box that isn't awful... so I'm betting Jobs will pull a few surprises, including a tablet Mac that's basically a super-sized iPod Touch.
Any but a cursory revision to Apple's iPod lineup is highly unlikely. The lineup was last refreshed in September, including the addition of the iPod touch, and Apple tends to announce its iPod updates at special events scattered through the year.
We also likely won't see a much-rumored Mac tablet personal computer, which has been discussed as a larger version of the iPhone, lacking calling features but including its touch screen. Jobs has never been warm about tablets, and the best current tablet computers, while reasonably good, haven't sold well.