well given the past sales history of the creed games im pretty certain there will be more of them but as for the title and direction of the series i can't say as of right now cuz there hasn't been any news on it yet.
ASSASSIN'S CREED: REVOLUTION ok heres how it is you play as a low profile 1600-1700's village man who is actually a descendant of ezio and he is now the father of a french revolution against the vorcha and they are out to find the crystal skulls(from indiana jones i dont know why but just flow with it) and with the crystal skulls they can teleport and freeze time almost like the artifact in ac 1 and 3
Ubisoft isn't ready to ditch Assassin's Creed. It's a very popular franchise that has millions of fans buying there copies of Assassin's Creed Revelations. So expect another game with a different story.
As for the name, it mainly depends on the story. They often times vary.