The wording in the thread title (and the article) gives a sense of an actual PlayStation 4 announcement/reveal at E3. But as BY2K noted, it's (probably) not that.
There is little Sony could do to wow me with software for PlayStation 3 or PlayStation Vita. Certainly they would want to end this generation with a bang, but for that wouldn't you need to bring out some big guns à la the mentioned Shenmue III, Half-Life 3 or Bungie's upcoming game to name a few? I suppose they could also bring back some beloved franchise to amaze the crowd, but what would it be, they've got a heap of series to choose from? Destruction Derby, MediEvil, Primal perhaps?
One thing I would find interesting would be a modern Vib-Ribbon with Spotify integration, with cross-platform play between PS3 and Vita. But I don't know whether that is something Sony is willing to invest in with the similar Audiosurf to compete with. Well, on the 4th of June we'll know what this is all about.