GameStop sells downloadable content for games these days, even for unannounced DLC it seems, as the "Lost Archive" DLC for Assassin's Creed: Revelations has appeared on the site for $14.99 USD.
Achievements for the DLC had beenearlier in the week, suggesting it was a single player mission for present day protagonist Desmond Miles.
According to the GameStop listing, the DLC will be released on the 28th February.
Assassin's Creed: Revelations "Lost Archive" DLC outed by retailer
18 February 2012 | By JonahFalcon