As of December 31 2014, an article has been posted hinting us that a new game will be coming. These are the words of a Japanese video game and anime producer and supervisor, Hiroyuki Kobayashi:
"In July of 2015, it will be Sengoku Basara‘s 10th anniversary, so I believe there will be plenty to be excited about. Also, in 2015 we’ll also have Devil May Cry 4: Special Edition, and the newest title from a series you guys have been waiting for, and [even] more titles to be announced that we hope you’ll enjoy.”
It doesn't prove that it will be a Mega Man game, but I have my hopes. Cross your fingers!