pokoko on 25 May 2015
If they released a Wii U version, we'd just hear people complain about it being gimped and how they didn't buy it because of that. The rationalizations would flow like wine. The studio knows that, I'm sure. With the PS3/360 versions being cancelled, there is no longer a "worst version" buffer.
Either way, it's a no-win situation. They're just looking to take the path of least financial risk.
I would imagine this will probably help set a precedent and I doubt many other studios will promise a Wii U version early in the development cycle, even if they're thinking about it. Better to announce for PC/PS4/XO and remain silent about the Wii U, then announce it later if it turns out to be feasible.
Essay Pro