Pretty sure it's a joke.
Wouldn't have necessary been bad to have had Robin, but introducing him would have dragged out the movie with another subplot, and just look how badly it was handled in B&R. I don't know how (or even if) the new Batman movies could handle it. Throwing a brightly-colored Boy Hostage into the canon is just going to look ridiculous after Begins and TDK. Something along the lines of an older Robin/Nightwing-to-be in a more sensible costume is the only way I could see it working, but I doubt it would fit in for at least the next film.
Wouldn't have necessary been bad to have had Robin, but introducing him would have dragged out the movie with another subplot, and just look how badly it was handled in B&R. I don't know how (or even if) the new Batman movies could handle it. Throwing a brightly-colored Boy Hostage into the canon is just going to look ridiculous after Begins and TDK. Something along the lines of an older Robin/Nightwing-to-be in a more sensible costume is the only way I could see it working, but I doubt it would fit in for at least the next film.