http://wiiublog.com/vigil-games-is-not-allowed-to-talk-about-the-wii-u-version-of-darksiders-2/
Joe Madureira of Vigil Games has confirmed what could have been assumed, in that they are “not allowed to talk about the Wii U version” of the Darksiders 2. Now, Madureira is the head of the company, so it definitely seems like Nintendo is the one stopping them from talking about the game. I would suspect this is because they want to show-off many of their third-party titles with a bang at the end of September.