My guess is they are worried about the Batgirl confusion. Its a bizarre line of reasoning.. we can have four robins running around.. but not more than one Batgirl. I really like Barbara, okay not 100% they should have ret-conned Oracle, but she has been cool in her Batgirl run in the DCNU. However where the hell is Stephaine and Cassandra.
Cassandra has been relabled as Black Bat (not sure of that name tbh) but no sign as yet, and like you said Steph is in the wilderness. DC has some damn fuzzy logic sometimes though, look at the whole Gail Simone thing during December for a perfect example.