what games will sony announce at E3.

[DerNebel]

JayWood2010 said:

Uncharted will be shown
Hopefully The Last Guardian
Santa Monica may show something if they had another game far in development other than the canceled game
Guerilla Games also has a new Ip in developement that will either be shown this year or next year
Media Molecule has also been working on something
Sony Bend as well

So there is 6 possible games from first parties right there. Then i expect them to show some third party stuff as well.  It all depends on how far all these games are indevelopement.  I think it is pretty safe on betting on Santa Monica, Uncharted, and Media Molecule all being shown. 

I think Guerilla said in a video that their new IP has been in development for 2 or 3 years now, so I think there's a pretty good chance of that being shown as well.