Though we've been getting the sense that developers don't seem all that interested in developing for the Wii U, Crytek CEO Cevat Yerli explained in an interview that it wasn't because of them that Crysis 3 failed to materialize on the platform. In an interview with VentureBeat, Yerli reveals that a version of the game had been running on Wii U hardware.
Business interests win again! Unfortunately, it's these kinds of problems that exacerbate the issue of the Wii U lacking solid software support. I don't know that Crysis 3 was likely to move units of Wii U hardware, but it certainly would have sent the message that this is a console perfectly capable of keeping up with the Joneses, something it sorely needs at the moment.