What can Bioware show?
-Mass Effect
-Dragon Age? What, for DLC? Unless its at least near-expansion (TRUE expansion) sized, I don't think so. And they are not going to announce the next game.
-SWTOR? Um they just had their story expansion. I don't think it'll be a highlight.
-Shadow Realms? Cancelled or moved into some other form or merged into another game or ...whatever.
-New IP? Hey, maybe! I'd take a teaser.
-New Star Wars game? Hey, maybe! I'd take a teaser.
So not much. So yes, I will expect a Mass Effect teaser, title, maybe more - in the presentation or in side content shown on the showroom floor.
I've lost my hope for the game releasing Late 2015, but Early 2016 and Late 2016 both look possible.
I really don't think we'll have to wait much longer to know what the next game is generally about. This is about a year later than I'd have hoped for that (maybe even two years), but eh, its coming. And yeah, I'd be very surprised if it isn't covered at E3 as part of the EA presentation.
That said, I think their focus (aside from SPORTSPORTSSPORTSUGHHH) will be on Star Wars: Battlefront. But if NME is slated for Late 2016, I can see NME being a focus at next year's E3.