Back on April 1st, original Fallout art director and Troika Games co-founder Leonard Boyarsky cryptically changed his Facebook profile portrait to an image of the famous Brotherhood of Steel power armored paladin from that game's box art. Easy to dismiss as some sort of April Fools jape, but then today Tim Cain posted this:
Some kind of joke? A few hours later, Leonard confirmed that it was not:

That's right. I'm very happy to announce that Mr. Leonard Boyarsky has concluded his ignoble ten year exile at Blizzard Entertainment and rejoined his comrades in real RPG development. That's two out three Troika founders at Obsidian. Come on, Jason Anderson, it's your turn now. I'm sure you're tired of working on multiplayer shooters that nobody plays.