Mass Effect 3. The user in question allegedly downloaded "test DLC" from a developer server, which ultimately unlocked all DLC for the title. Originally posted to a Facebook profile and subsequently picked up by Reddit, the image itself shows off several multiplayer characters, including the Geth Infiltrator and Engineer, Batarian Soldier and Sentinel, the Krogan Battlemaster and the Asari Justicar.
Some are speculating that this is the DLC included with Mass Effect 3 action figures, though BioWare noted earlier this year that said DLC was "slightly randomized" and could include anything from new characters to new weapons, mods or upgrades.
We've contacted EA to confirm the DLC and, hopefully, to find out how players can obtain it.