Most people seem to be of the assumption that Dishonored 2 is this year's Fallout 4 announcement thing where it's the star of the show and the last thing covered. I think it's likely that the big thing is a reveal of a new unannounced game, though, and there's likely going to be a bunch of other reveals like Doom DLC and content updates (particularly for Snapmap), ESO expansion(s), Fallout 4 DLC, etc spread throughout.
It should be noted that Redguard and Starfield are possible games that might get announced as well, although it's possible they are both BGS projects (it is easy to suspect BGS as the developers of both titles after all considering the complete lack of rumor mills surrounding the trademarks), so they may remain unannounced for another year or two (or more!). Skyrim for Xbox One and PS4 is speculated as a possible announcement as well. I don't know if that's too likely to happen, though.
I think Battlecry is supposed to be free-to-play, but maybe they're shifting away from that at this point in time. I think Battlecry is more likely to be talked about at E3 than TES Legends (though the latter may get mentioned one way or another, and if talked about at all it would likely involve announcing a release date or something).