Finished the story today. I was ultimately pretty satisfied with how Edward's tale ended, and while I actually wouldn't mind seeing more of him, I'm not really sure how his character would fit into a sequel.
I was disappointed in the real world Abstergo part of the story. There's obviously more coming, but I'm wondering if at this point they're just dicking us around because they don't know how many more games they're going to make. I still have a lot of computers to hack, though, which may shed some light on this part of the game.