IGN has a new story about the movie with a few more details.
Director: Rick Morales (LEGO DC Comics Superheroes: Justice League: Cosmic Clash
Writer/Supervising Producer: Michael Jelenic (Teen Titans Go!)
Writer/Producer: James Tucker (Justice League vs Teen Titans)
Executive Producer: Sam Register, Benjamin Melniker, and Micheal Uslan
According to IMDB Morales has also directed LEGO DC: Batman Beleaguered and LEGO DC: JL: Attack of the Legion of Doom, and a couple of LEGO Scooby Doos, and episodes of Beware the Batman, Green Lantern: TAS, Generator Rex and Ben 10: Alien Force.
Tucker wrote Vixen for CW Seed, and one episode each of Batman: The Brave and the Bold, and Batman Beyond.
Jelenic's got a pretty big list of writer credits for animation including The Jackie Chan Adventures, The Batman, Legion of Super Heroes, a screenplay/story credit for the animated Wonder Woman movie, and several episodes of Teen Titans Go!
That looks like a pretty good group, they've all done at least one or two things I've liked.