In what should be no surprise, Ubisoft has confirmed with Eurogamer that there is an Assassin's Creed Anthology on the way that will include all five games from Desmond Miles' adventures with the Animus.
The story was originally outed on a Russian Assassin's Creed site, which reported a listing on Amazon France for the five-game collection. The listing also claims that all of the DLC for the games will be included, but it (of course) did not mention if this includes any unreleased/unannounced DLC for Assassin's Creed III.
Ubisoft is supposedly going to release more details this week, including price, release date, DLC confirmation, etc.
