Well, I have worked on games I have tried to get on wiiu and the first step if you are interested is signing up to be a third party developer, if you are interested. https://wiiu-developers.nintendo.com/It is actually very easy to use construct 2 to make games but it is a good idea to communicate with other third party developers while developing games.
The experience I have had of making games for the WiiU is actually very fun, and well thought out, none of my games have officially made it on the system due to my own personal life events(Recently got married, Recently moved, Recently lost my part-time jobs, Recently had to drop out of college due to money issues).