A couple surprises although not quite the characters some have been asking for (you know the ones that keep coming up.)
First is Lady Vic. I vaguely remember her from the Dixon Nightwing series. I don't think she was ever pushed enough into being a well known villain but she always had potential. Her mask certainly created a a memorable look. Lady Vic will make her new 52 appearance in Batwing to face off against Luke.
In RHATO there's Bronze Tiger. I'm not sure if he's an actual tiger this time or will turn into a human half the time but this sort of reminds me of what Lobdell wanted to do with Crux.