Because of the Bane vs. Batman bit we saw in the trailer? heh. heh. Perhaps. But I'd love to see these 2 work together in the field.
Now that you mention it, have we ever seen the back-breaking in animation? I don't think we have .I think I mentioned this before, but I kind of hope the infamous fight between Batman and Bane from the comics doesn't happen here. I wouldn't really want to see both Batman with a broken back and Oracle in the same Season... but I'd still watch it even if it happens.
I wonder if we'll see Batman interact with Robin, Spoiler, and "mystery caped girl" at all this season...But yeah, a Batman & Nightwing team-up would be pretty cool. I guess it might be too much to hope for a full episode focusing on the entire Bat-Family.