Frequency on 06 October 2013
Announced 23rd of jan, released october 4th.
At the time of announcement the game was already in a presentable state to show it off for the announcement, so what we are looking at is a minimum of 9 months from announcement to release, if they claim 6 months total to develop and we assume that the game was roughly half done when announced, that still leaves 6 months between completion and release, so you really have to wonder just why the hell Nintendo are dragging their heels so much for a console that is starved of games.
