The studio’s Gotham City Sirens is also expected to include the Batgirl character, so it’s possible that movie may serve as an introduction to the character, before her stand-alone Batgirl movie.
In related news, Entertainment Weekly reports that Joss Whedon will base this Batgirl character on the New 52 comics reboot version.
Take a look at the tweets from Lindsey Morgan, which may hint that she has been cast as Batgirl.
This project started development last month, which makes sense, since yesterday’s report was the first anyone had heard of a Batgirl movie being in the works at the studio.