One question : are you also gonna do the wonderswan game (Megaman and Bass : Challanger from the future) ?
Mirai kara no Chousensha will not be in the core. The Dimensions showing up in the Robot Museum is all it's getting.
There was a fan project called
The Forgotten Adventures, which adds additional chapters based on other games and Mega Man media, but interest died off from that. One of the users involved from that project, Magnet Dood, is currently working on
DOS Reborn, based on a reimagining of the PC games by Simon Stafsnes Andersen, the guy who made
Owlboy. But progress on that is going slowly, mainly due to school work. But with summer comming up (in fact, the solstice is tomorrow), I'm sure it will pick up again soon.
fortegigasgospel, who spearheaded The Lost Adventures, is still working on the
Original DOS Completion Project, but he still has quite a lot to go.