Atlus USA got the rights to them.
Atlus U.S.A., Inc. Announces Super Robot Taisen
03-03-06
Giant robots wage intergalactic war in two heavy-metal strategy RPGs! More...
For those that aren't familiar with the franchise, the latest GBA installment featured a multitude of FMP characters and mecha. HOWEVER, these games (the one's with char/mecha from other series) may not make it over, because the licenses to each franchise featured in the game must be covered, which will be near impossible to do, financially. (each game features 10~ or so franchises) The reason these can come over is because all of the content is original, and offers no cameo's from outside franchises.