The claim comes from a very unexpected source: basketball star J.J. Redick, who apparently has a scene in the film along with a number of other players from Redick's Los Angeles Clippers and the New York Knicks.
Of course, since Redick is not a "Hollywood guy," there is always the possibility that "Half-Shell" is a working title, a temp title or a placeholder being used on set.
You can check out the full video before; the Ninja Turtles 2 material comes around the 45-second mark.
The cast from the first film will return, along with Victoria's Secret model AlessandraAmbrosio joining. David Green will direct a script from Josh Appelbaum and Andre Nemec.
Teenage Mutant Ninja Turtles: Half-Shell is expected in theaters on June 3, 2016.