Next month Warner Brothers releases Teen Titans: The Judas Contract as their next animated feature. Along with that release, there is apparently information about the next DC animated film.
The next feature will be a team up between Batman and Harley Quinn. The animated feature will be Executive produced by longtime Batman: The Animated Series and Justice League writer/director Bruce Timm based on his original story.
The first image from the film was available on the iTunes page for Judas Contract and it has the look and feel of classic Batman: TAS. Batman and Harley Quinn comes out this summer just in time for the 25th anniversary of the original series.