I get the feeling Barbara will have a role in it. Think of it this way. if they adapt anything from the early comics, Babs didn't meet Dinah face to face till like in the twenties of the original series. What if the movie has that sort of spin on that? That every time the gals are on the ropes a mysterious being known (who even lured Harley into helping out Cassandra) helps them. This being name is Oracle and at the end of the movie Cassandra stays with her. Cue this leading into the Batgirl movie where you have two.