At end of February they said that game will be released this year, that means that game basically was almost finished.
Once again, words mean nothing if you can't back them up. If the game was near completion as they claimed, then they would have shown something by now. Especially for e3, you know, with all the other 2015 wii u games. They didn't show anything else, nor have they given more details, meaning they either hit a bump in the road, or gave up