In a recent post on the Mighty No. 9 development blog, Keiji Inafune apologized for pushing the game back from its expected February 9th release date. The decision came after the development team realized it simply did not have the time to squash all of the networking bugs before release. The key problem turned out to be one that affects all the network modes slightly differently and requires a separate fix for each version of Mighty No. 9. All of this led to Inafune's apology:
Unfortunately, this is all a result of miscalculations on the part of us, the development staff. As a result, our fans who have been looking forward to Mighty No. 9 have been forced to wait for over half a year longer than expected, and for that we are sincerely sorry. I want to take this chance to apologize personally, and on the behalf of the development staff.
Instead of the February 9 release date, Mighty No. 9 will be launching sometime during spring this year. It will be released on PlayStation 3, PlayStation 4, PlayStation Vita, Xbox One, Xbox 360, Wii U, 3DS, PC, and Mac.