Joss Whedon is going to write, direct, and produce a Batgirl movie about Barbara Gordon. This version of Barbara will reportedly be based on the New 52 version from the comics. The movie does not have a release date or lead actress at this point. It's also unknown whether Barbara will show up in The Batman, Justice League 2, Nightwing, or Gotham City Sirens (though I would deem an appearance in at least one of these films likely).
On a related note, I'm going to go ahead and fancast Felicia Day.