If I'm not mistaken, MegaBlocks make Marvel toys, so I don't think Lego can do them.
sadly, this is the case. they signed a 10-year deal back in 2004. After it expires, I would love to see a Lego X-Men game. but as things stand now, we usually get a new Lego game after a new series of Legos are introduced, so I am anxiously awaiting word of a Lego TMNT game