Bethesda E3 Conference - June 14th

[Bolivar]

Doom (4) is more or less guaranteed to get its official public rollout, since they unveiled quite a lot of stuff to attendees at last year's QuakeCon.

As far as what Bethesda Game Studios is working on, it sounds natural that they are alternating between TES and Fallout. But Skyrim selling over 20 million copies changed all that. It would just not be feasible for any company to wait 8 or 9 years to release the follow up. You could say TESO aimed to fill that gap but it has since failed to deliver critically or commercially.

A lot of people are hoping they passed Fallout off to Obsidian, given their pedigree and the reception of New Vegas. I don't know how big Obsidian is but they just shipped South Park last year and wrapped up Pillars of Eternity recently; Ron Perlman confirmed last year Fallout 4 is in development (and that he's not in it) so unless Obsidian has extra manpower, they might not be involved after all.

There's also Arkane. They are a two-team studio and one of their current projects is almost certainly Dishonored 2. The other was rumored to be Prey 2 but Bethesda confirmed the franchise was put on indefinite hold a while ago. They acquired Arkane based on what they did in Dark Messiah of Might & Magic, so a lot of people feel they were brought in to build on the first person combat in Bethesda Game Studio's RPGS. I could see them assisting on Fallout or even taking on a TES spinoff.

Tl;dr - we're likely to hear about Doom, Fallout, and even Dishonored but I would be surprised if there wasn't anything about some form of new Elder Scrolls entry. There's a chance it is in fact BGS' next game.