I think it would be stupid to show the ps4 on this years E3. Ps3 sells good compared to the other two right now. So I guess no ps4 on this e3. I think they'll show it on gamescom or TGS together with a ps3 price drop and release it right after e3 2013.
for this years e3 I'm pretty clueless what they'll show
they need to support the vita so I guess/hope they show something big for it
and I'm still hoping for a onimusha , don't care if exclusive or not I want it !