From the page: "e studios love to mess with their fans on April 1, so when a website went up for the hilariously retro Far Cry 3: Blood Dragon expansion, many assumed it was just another prank. However, there are a few convincing indicators that this mysterious expansion is the real deal: 400G's worth of Blood Dragon Xbox Achievements have surfaced, and now a handful of screenshots have appeared as well. Though the expansion hasn't been officially announced, we've got more than enough pieces to put the puzzle together.
The amusing retro Blood Dragon website makes it out to be a classic B-movie, complete with an interview from its fictional director. There's also an appropriately cheesy story teaser: "The year is 2007. It is the future. Earth has been ravaged by a nuclear war and new paths for peace must be found. A U.S. cyborg army may have found a solution: a powerful bioweapon on a distant island. A Mark IV Cyber Commander, Sergeant Rex Power Colt has been sent over to gather information and figure out what the hell is going on."