We now have a very clear idea of what Batgirl will be about and the type of Tone it will have.
In a recent interview when asked about Batgirl the Director Joss Whedon (Avengers, Buffy The Vampire Slayer) was very top to the point on what he wants Batgirl to be about and what it will explore
“She came up, and I started getting obsessed with how a young woman could get hardcore enough to need to put on the cowl. Like, What’s her damage?”
“She didn’t have her parents killed in an alley. Who is this person, who decides — rather than being forced to by their childhood trauma — decides to pick up this life? How intense and driven that person is … I just couldn’t stop thinking about it.”
By the sound of it Batgirl will be a more personal Story focusing on the Character and her state of mind more than anything else.