So my guess is we'll get gameplay demos of a ton of stuff, things only announced last year, such as Sunset Overdrive, (more) Quantum Break, Rime, The Witness (if that's E3 material) and a lot more.
I wouldn't expect anything of Battlefront, but maybe Mirror's Edge 2. Isn't there a new Mass Effect rumoured?
Speaking of rumours, we might get something on Dishonoured II, and Resi Evil 7 may be an Xbox One exclusive.
Also, E3 2015: Vince Zampella onstage for Sony announcing Titanfall 2 launches on PS4 at the same time as the One.
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From Microsoft: Halo 5 trailer, H2A, obviously no Gears, Fable Legends, Quantum Break for 2015, Sunset Overdrive, Forza Horizon 2 (Forza: Deep South), and not much else unless Microsoft has some big secret. From Sony: Uncharted 4, The Order, DriveClub, The Last Guardian (lol), Santa Monica game, Media Molecule game, probably not much for the Vita, probably some other games they're publishing. From Nintendo: We'll see more Smash Bros, the new Zelda for Wii U, probably a bunch of other stuff they have in development. It'll be interesting to see if they move the Wii U to the sideline or give it the spotlight. They really need to hit E3 out of the park. As for third party stuff: ACV, no Mass Effect, new COD, Destiny, Battlefront III, Dishonored II, maybe Fallout 4, FFXV, Arkham Knight, maybe new Deus Ex or Sleeping Dogs.