How likely that they'll bring Robin in the sequel?
I think it was hinted a little bit in the movie:
Alfred dropped "The Circus" referring to his former workplace.
Catwoman mentioned "Bludhaven," the city Robin ends up after becoming Nightwing.
The whole focus on mobsters as the villains. And the fact that Penguin is set up to be the main adversary in the next movie (probably along with Joker.) Traditionally, Robin's parents were killed by the mob.
And Batman's cowl looks like a homage to Adam West version's cowl design. Which has Robin as his sidekick.
What do you guys think?