Because Fallout: New Vegas just wasn't weird enough -- unless you had the right Perk -- Bethesda came up with the Old World Blues add-on. The third DLC explores the origins of the Mojave Wasteland's super mutant population, but as today's trailer shows us, super mutants are the least of the Courier's problems.
So you have this research facility where terrible things have no doubt gone on, and the place is occupied by robots of every make, many of which possess actual brains. Looks like Rex isn't the only robo-dog to survive the war.
Old World Blues will be released on July 19.