The developer here mentions that they used Visual Studio -- a microsoft made IDE. What kind of dev support might you expect from there? WiiU does allow the use of Unity Tools and HTML5 which should allow for easier cross-platform development.
The team behind the Darksiders2 port said it only took a team of 3 people 5 weeks to port the game, improve the graphics, and throw in some gamepad features
I predict NX launches in 2017 - not 2016