Based on the current Amazon France listing, the collection only includes Assassin's Creed, Assassin's Creed 2, and Assassin's Creed 3; but not AC2: Brotherhood or AC2: Revelations. However, Russian fan-site Assassin's Creed RU claims it pulled an image from the listing (now apparently taken down) which says the anthology includes all five games, and all available single-player and multiplayer "bonus content." The image also details lithographs for each game and a steelbook case.
Given that Amazon France is selling Assassin's Creed 1-3 separately on Xbox 360 for just under €76, a 3-in-1 collection at double the price would seem, to be kind, ambitious. To be less kind, it would be downright crazy, and very odd given the already announced Ezio Trilogy coming to PS3 next week. Once we confirm what's included in the anthology and where it's headed, we'll be sure to let you know.
[Image Source: Assassin's Creed Wiki]