Because of the early launch issues, this one will be free for all of us, so don't forget to enjoy some free extended gameplay!
Based on the trailer, it looks like Napoleon Bonaparte will play some role in this DLC as it looks like him at 0:27. Assumably, a negative role as he's seen paying off some grave robbers. Certain fan sites have also found hints that Napoleon has posession of the Apple of Eden.
Check out this video by ACConspiracies. Nice find by them!
It's always great to get additional story DLC after the game, but when it's free.. that's just awesome!