I think Sony's going for a trifecta again this year and even though it seems too soon I think an early trailer of Kojima's project could be one of this year's 3 megatons.
I think the other 2 could be Crash Bandicoot (I've never believed the return of Crash until Shawn wore that shirt back in December) and Agent (now a smaller game, maybe multiplat but still a megaton for PS fans). Maybe God of War IV set in Norse mythology will replace one of these or just add to the awesomeness like Horizon did at last year's E3.