Will Krang, Bebop, Rocksteady or the Technodrome appear in the current cartoon?
No. The 4Kids TV series is based on the comic books by Eastman and Laird, so the characters that were created specifically for the original TV cartoon will not appear in the new show. Some characters that originated in the Mirage Studios comic books, such as Leatherhead, will appear in the new series, but they will be portrayed as they were in the comic books, not the original animated series.