A straight to DVD on 7/7/2008 that will also be available in Blu-Ray. Kevin Conroy reprise his role with the voice of Batman!

From Batman: Gotham Knight Wikipedia

Batman: Gotham Knight is a 2008 animated direct-to-DVD anthology film of six animated short films set in-between Batman Begins and The Dark Knight. Each short, or segments, are written by Josh Olson, David Goyer, Brian Azzarello, Greg Rucka, Jordan Goldberg and Alan Burnett. Each segment has its own writing and artistic style, just as the works from the DC Universe. The six films all star Kevin Conroy, reprising his role as Batman from the DC Animated Universe.

The film uses a Japanese anime style for the animation. It is similar to another tie-in, The Animatrix, as both are collections of short films of Japanese origin. It is the third in the line of DC Universe Original Animated Movies released by Warner Premiere and Warner Bros. Animation; with the first two releases being Superman: Doomsday, Justice League: The New Frontier, and the next release following will be Wonder Woman. It is officially rated PG-13 for stylized violence, including some bloody images[2]. This film is notable for being the first DC Original Animated movie to have a connection with another Batman media. Unlike the last two DVDs, in which they were the first to be rated PG-13, this movie is not the first animated Batman film to be rated PG-13 (that claim goes to the uncut version of Batman Beyond: Return of the Joker).
Official Batman: Gotham Knight website

Batman: Gotham Knight - First Look on You Tube