It would be something of a revelation to know that Ubisoft has even more content in store for Assassin's Creed Revelations, this time in the form of a single player DLC.
The revelation comes from an updated list of achievements for Assassin's Creed Revelations. The roster includes references to a new DLC, specifically with references to Desmond rather than his historical counterparts Ezio or Altair.
Previous DLC achievements were specifically for the game's multiplayer mode. According to the website XBox 360 Achievements, the new achievements are "Jump They Say" and "Save Yourself" which are worth 250 Gamerscore points altogether.
VG247 notes that the original release of Assassin's Creed Revelations featured two extra pillars of memory, which tease the existence of single player DLC content.
We've contacted Ubisoft for confirmation.