Bethesda has quietly registered itself to present a role-playing game for the PC, Xbox One and PlayStation 4 categories at the upcoming E3 this year, leading many on the r/games subreddit to speculate that Fallout 4 may be getting exhibited.
The publisher has also registered titles under "Free-to-Play" and "Action," which could refer to Battlecry.
Of course, as redditors point out, The Elder Scrolls Online, which is launching on the Xbox One and PlayStation 4 a week prior to E3, could easily fit under the "role-playing game" category. Exhibiting an RPG doesn't necessarily mean that they're announcing a new one, especially when one considers that Valve exhibits DOTA 2 under the "strategy" genre.
E3 takes place this June. Just try not to get your hopes up until then.