My most wanted are (only 12 will be announced):

1. Software Emulation BC added
2. Music Store
3. Acquisition of closed partners (Sucker Punch, Level 5, Media Molecule,etc..)
4. Establish a studio that will develop WRPGs and a studio that will develop JRPGs
5. New PS3, PSP games (Elder Scroll Travel, GTP where are you)
6. PSP, PS2, PS3 price drop
7. GPS for PSP
8. 'Home is live tonight'
9. Syphon Filter PS3
10. GT5 coming next year/Damage model added to GT5P
11. 'Europen movie store live tonight'
12. Wireless Singstar (I'm pretty sure this one will be announced)

Leipzig is where SCEE like to show off their stuff, so we might see the "BBC game" there as that seems to be from one of SCEE's studios.

As mentioned, some things we already know are coming should get more detailed announcements; PS3 bundles, PlayTV dates for countries other than UK, maybe some more Platinum titles announced.

Seeing as it's looking unlikely PS3 will get a price drop this year it wouldn't surprise me if SCEE threw in a couple of titles from their new platinum range with the new 80Gb SKU.

I think it's only a matter of time before the next Naughty Dog game is formally announced.

With the other big exclusives out there that are already on the way, I guess they can afford to hold this back for a while though.

I bet a large % of these announcements will be similar to the E3 announements. Wouldn't expect to be amazed by anything other than heavy rain and maybe a new game or two. Safe predictions-

1. new ps2 bundle
2. new ps3 price drop- 40 gig price for new 80 gig standard
3. new psp bundle
4. video store/service announced
5. heavy rain shown
6. other mystery "amazing" game shown
7. wipeout shown, (problem solved) release date
8. little big planet beta and release date
9. casual game features and release dates- singstar, buzz, etc
10. a few new Euro-specific psn games
11. something GT5 related
12. a random game like an eyetoy game or twisted metal or something