cool story bro.
I just looked through that IGN article, there's a lot of people that are flipping at the "hints of a next game". Well, duh there's going to be a next game, this game sells like crazy. These hints for the next game don't mean dick though. Arkham Asylum had a bunch of hints towards the next game and it was only one that actually had anything to do with AC and no one even found it. The titan getting off the island turned out to be nothing, the random villain grabbing onto the titan at the end of the first game meant nothing except at most, a cool easter egg in this game. Right at the end of the game Batman goes off to foil two-face robbing a bank, so people are looking waaay too far into these things, 95% of them won't mean diddly squat in the next game.
The Azrael storyline and the Hush storyline are cool, but him saying he's going to take care of it tomorrow doesn't mean anything. Of course he is, he's friggen Batman. Batman doesn't just go on one adventure and then call it a day, he's constantly out there doing shit. Doesn't mean they're hinting at a sequel.
The whole Hush thing was kinda funny too. In the comics he always knew Bruce was Batman, and in this he doesn't seem to have a clue. You'd think someone who studied Bruce Waynes face would recognize the bit Batman has showing.