If fairly certain that Capcom( Kazuhiro, the current series producer, said this), that a new game is in the works. He said that back in september of last year.
Megaman 11 currently sits at 1.2 million units. For a franchise that just came back from the dead, and with an incredibly low budget, that an outstanding performance.
Plus they haven't stopped releasing new megaman collections. It's been safe to say, for more than a year now, that Megaman is back.
And probably the next game is X9.
Capcom has also said things like they were making Mega Man Legends 3. I've been hurt by them before. I'll believe it when I see it.