Ubisoft said a couple of years ago they want to make it a yearly franchise. They seem to be making good on that. I had my doubts about that plan, and it probably will go horribly wrong, but AssBro was so good that until the games themselves prove otherwise, I'm on board.
That said, the scant details about the premise of AssRev already make me excited. The idea of placing the game in Constantinople in three different time periods is really cool, especially considering the time periods themselves: during the Crusades, after the Turkish conquest of it, and of course modern day. It'll be pretty awesome to explore the same city (and an awesome city at that), but in three distinctly different times that had three distinctly different cultures at the time.