A new LEGO Batman Movie Minifigure polybag has been revealed on reddit. This minifigure is know as LEGO 30612 Batgirl and consists of some yellow bat-discs pieces as well. The set should be available soon at one of the big box retailers soon (Wal-Mart, Target, Toys R Us) or through a LEGO promotion. Thanks to John for the heads up.
LEGO Batman 30612 Batgirl Minifigure Polybag Set