Update: It appears Obsidian's something awesome is a Kickstarter for Pillars of Eternity Lords of the Eastern Reach. A new card game, which has already met its goal. You can find out more here.
Original: Obsidian are teasing something new, presumably for E3.
Something awesome is on the horizon...— Obsidian (@Obsidian) May 28, 2015
The developer is famous for games such as Fallout: New Vegas, Wasteland 2 and even Knights of the Old Republic, although this latest tease may be an expansion for its recently released RPG, Pillars of Eternity or who knows, it could be something different entirely, perhaps something Bethedsa related.
We'll find out soon either way.