Despite promising the game won't be delayed anymore, Keiji Inafune today announced Mighty No. 9 has been delayed a third time...
Take it away, Inafune (emphasis mine):
tl;dr the delay has to do with network bugs and matchmaking across all platforms. The game is now set for an ambiguous 'Spring 2016' release.
For the uninitiated, the game was original due in April 2015 then bumped to September 15th, then to February 9 of this year.