Truthfully, i do not know what to expect this year.... I followed the last couple of MWSF, and there were some leaks and hints. This year since the laptops got a revamp/refresh, ipods got a refresh, and there really has not been much talk about what is coming at MWSF, so I think the only things left are:
New/updated iphone - yep you know that will be in there.
Snow Leopard - Hopefully we hear something

that front has been kinda quiet. I thnk there was only one developer release since it was announced at WWDC.
Maybe a new ilife 09
maybe some new enhancements to iwork
MSWF is usually the place for rolling out something new, so lets hope (but I am not holding my breath):
1. Economical Netbook to stop all the whining (although one would be cool).
2. Slate tablet or netbook tablet.
3. Blu-ray to stop all the whining.
4. New mini to stop all the whining. I think the mini form factor is great as it is, but it could use some higher specs.
But no matter what happens - there will be some oohs and ahhs, but also some "Dang they didn't..."
Pretty much looking across the board, here are some things that are pretty much at the End of Life and need some new ones:
1. Mac Pro
2. Mac Mini
3. Imac
4. ACD - ok, they came out with a new LED 24", but most of us can't use it yet.
those
4 seem to have been left in the dust recently.
*Edit, before someone says I can't count - I had added a 4th item, but neglected my last sentence - fixed.