The show will be based on the Batman TMNT miniseries comics.
The voice cast according to SyFy Wire:
The film’s voice cast features Troy Baker (The Last of Us, Batman: Arkham Origins) as both Batman and the Joker (making him the first actor ever to take on both roles in one project), Darren Criss (the Emmy-winning star of The Assassination of Gianni Versace: American Crime Story) as Raphael, Kyle Mooney (Saturday Night Live) as Michelangelo, Baron Vaughn (Grace and Frankie) as Donatello, Eric Bauza (The Woody Woodpecker Show) as Leonardo, Rachel Bloom (Crazy Ex-Girlfriend) as Batgirl, Tom Kenny (SpongeBob SquarePants) as the Penguin, John DiMaggio (Adventure Time) as Mr. Freeze, Tara Strong (The Powerpuff Girls) as both Harley Quinn and Poison Ivy, Carlos Alazraqui (Reno 911!) as Bane, and Cas Anvar (The Expanse) as Ra’s al Ghul.https://www.syfy.com/syfywire/exclusive-batman-and-the-teenage-mutant-ninja-turtles-meet-in-first-animated-movie
We can look forward to Batman vs. Teenage Mutant Ninja Turtles arriving on 4K, Blu-ray, and Digital in spring.