It is being reported that the Karai character has been recast with Brittany Ishibashi taking over for Minae Noji, who played Karai in the first movie of this series.
I don’t like when actors and actresses are replaced but Karai didn’t play a huge role in the first movie so this may go unnoticed for some.
In other TMNT 2 related news, it is being rumored that Krang will indeed be debuting in the sequel. There are even reports of a scene already being filmed where Krang enters the Earth. Very cool and I hope the rumors are true!