I didn't really care about Defenders, but I wasn't very interested in the line-up. Avenging Spider-Man is fun, though.
So I guess Bendis' big Avenger-y finale is going to be about Ultron. The Free Comic Book Day Marvel book is a reprint of Avengers 12.1 which ended with Ultron returning to Earth. It's funny how they put out that issue months and months ago, yet nobody ever mentions Ultron after that! I hope it's a crossover between all the Avengers books!