I have yet to be dissapointed to the point of wanting to return an AC game, and in fact find myself going back to play all of them every so often, so I am very much looking forward to this. Seeing the story from the Templar's point of view for the entirety of the story should certainly be interesting.
I also quite like the idea of being hunted by an Assassin while just playing the game normally, should be awesome to have the tables turned on us for once.
Also, I'm likely in the minority here, but praise be to Atheismo that Cormac wields a dagger in his off-hand instead of a second full-sized sword, that drove me nuts in Black Flag, hopefully we'll also see a return of blunt weapons and axes as well. Never cared for being forced to use swords and nothing else as a main weapon.