So here's what we know.
1. The game will involve Batman fighting eight of the most deadly assassins in the world on Christmas Eve.
2. One of the eight assassins is Deathstroke.
3. The game will make use of the same engine that Rocksteady used for Arkham City.
4. The game will span the whole of Gotham City - not just the Asylum or the relatively enclosed area of Arkham City.
5. The game is slated for release in October 2013.