Producers Brad Fuller and Andrew Form recently revealed the info to Omlette:
“We can say that Bebop and Rocksteady are in the film, and Casey Jones is a character that we love and we’re trying to fit him in as well”
The confirmation follows news of a new director for TMNT 2, with it also said the move is going in a different direction than the first.
Michael Bay is returning to produce, and TMNT 2 will also see the return of Megan Fox, Will Arnett and the character of Shredder.
Teenage Mutant Ninja Turtles 2 has a June 3, 2016 release date.
Here is the Bepop and Rocksteady concept art, which also includes Krang: