The Korean ratings board just rated Assassin’s Creed Ezio Collection for both current generation consoles.
There has been no announcement for this collection by Ubisoft and given the lack of an Assassin’s Creed game release this year, I see why the release makes sense. As of this writing no other information is available barring what is listed on the Korean ratings board. You can view the ratings here and here.
The collection will probably include Assassin’s Creed 2, Brotherhood, and Revelations.