Lobo doesn't sound like anything I'm much interested in, but I like the sound of Gotham Girls. How easy is it to find, for those interested?
Also, going to argue with you on the Nolan thing. I think Harley could be bought in in a subplot in Arkham. Joker doesn't even have to appear onscreen, really. All we have to see is a general outline of him in the shadows, and if people really want the Ledger!Joker, someone can probably do a pretty decent impression. She could potentially be good setup for later movies, but, then again, if they're looking for wrapping up the trilogy, then it might not be such a good idea.