Oh, honestly - well, at least it's this month. My hope is that if it's NOT Cass, it'll ultimately wind up being a Battle-for-the-Cowl-esque fight between her and the new Batgirl - and she'll get her old job back. I think there's a good chance of this, as DC seems inordinately fond of this type of storyline - they've done it for just about every major character, and a number of the minor ones. Batman's been through it multiple times, so have Superman, Wonder Woman, the Flash, Superboy, I think Supergirl, Nightwing, the Metal Men, etc., etc. It only makes sense that Batgirl will get her turn at it.