Ending and character at very end
So is Batgirl going to get a solo DC animated movie in 2017, or will they just add to her to the next Batman animated movie?
A solo Batgirl movie doesn't seem likely to me, but she might play a larger role in future films. Of course, Babs will play an important role in Batman: The Killing Joke, but not so much as Batgirl. That is probably a stand-alone story.
"A revolution without dancing is a revolution not worth having." - V
Killing Joke will be it's own story... as it reunites Conroy and Hamill as Batman and Joker...
the animated film continuity so far seems limited to projects with Jason O'Mara as Batman (the few casting changes within those films is based more on Availability than continuity)