It should come as no surprise, as we haven't heard anything leading up to this announcement, but Shredder himself, William Fichtner, has confirmed that neither Bebop nor Rocksteady will be making an appearance in Teenage Mutant Ninja Turtles.
Did we want them to?
The actor has gone onto tease his own character, the evil leader of the Foot Clan. As we /shredder-gets-a-new-identity-in-teenage-mutant-ninja-turtles/previously warned fans, this Shredder is not Oroku Saki, the original Japanese identity of the character in the TV series, comic books, and past movies. Instead, William Fichtner is playing a man named Eric Sachs. We don't know too much about this new character's background, but it sounds like he went through quite the evolution from script to screen, as the story continued to change throughout production.
"What I read about Eric Sachs in the script was great, and then how the character has been moulded and changed when we started filming has become something really quite remarkable in terms of what we've seen before of the character."
The actor then went onto tease the look of the turtles.
"They are some messed up mutant turtles!"
That doesn't sound promising. Maybe the actors should stay quiet until we see what the movie looks like.