Bay made the announcement on his official website.
TMNT: we are bringing Megan Fox back into the family!
Megan Fox starred in the first two Transformers movies before a falling out led to her being removed from the franchise. Reportedly it was over a "Jewish" remark and Steven Spielberg.
That all seems to be past Fox and Bay, and regarding the character Megan Fox will be playing, Variety has it that it's April O'Neil, with Jane Levy, Anna Kendrick and Elizabeth Olsen said to have been in contention.
It's also stated that a lead male role is now being sought after for the Ninja Turtles movie.
Jonathan Liebesman is the director on the new reboot with Bay producing, which is based on the classic Teenage Mutant Ninja Turtles characters.
Previously it was said that the movie would be dropping the teenage aspect with a brand-new alien origin.