User blog comment:ADour/Official title for Marvel's The Avengers sequel announced!/@comment-4651179-20130721032030/@comment-3317214-20130723230658

One extra character, so far as we know. We could see a couple of other Batman supporting characters, like Alfred...

Anyway, Batman's not your average supporting character. If they add Luthor, we have Superman's arch-enemy appearing in a Superman film. If they add Batman, we have to of the most popular superheroes ever in the same movie. It means that the universe expands beyond Metropolis towards Gotham. And it implies that Batman has his own threats that he faces in Gotham. If that's not universe building, what the hell do you think it is?

I didn't say it'll work because it's true to the comics. I said that fans are usually partial to that stuff.

No, buddy movies haven't waited for the sequel. This one will.

Of course Batman/Superman movie is the sequel to Man of Steel. But in the same way that The Avengers was a sequel to Iron Man 2.