I'm predicting Turtle Mania 2 with the 2023 movie by Seth Rogen. LEGO would be wise to get the rights back to TMNT.
Also, Nickelodeon's corporate structure might be different these days under the Paramount flag. LEGO came out with a Sonic set this year. Those movies are distributed by Paramount. So maybe there's hope for TMNT LEGO to return?