1. Will an MGS 4 gameplay trailer be shown at E3? It wouldn't be E3 without one. :)
2. Will a PSP redesign be announced/shown at E3? Sony has a lot going on at the moment. I'm 50/50 right now on this one. But if it's going to be coming this year, it should be announced at E3.
3. Will a Price cut be announced for the PS3? Pretty much a done deal at this point.
4. Will there be a Playstation Store announced specifically for the PSP? Specifically? No. Improvements? Yes.
5. Will there be any info on FF XIII shown at E3? There may be a new trailer but I wouldn't expect much else.
6. Any surprises from Sony? If so, what? Sony was trying to keep the price cut a surprise. Other than that, we expect things like rumble and more details on Home. I'm not sure what else they could have up their sleeves. After last year's boring presentation, my expectations are quite low. So they can only improve this year...