TorontoGameDevs.com recently did an interview with Neptune Interactive about The Castle Game.  The game is available now on the PS4 and is still planned for the Wii U sometime next year.

TorontoGameDevs.com: Is a Wii U version still in the works? How is that coming along?

Yes it is. We’ve put a pause on it in order to get the PS4 version out. We’ll probably get back to it to release for next year. It is a fun console, especially with the second screen. I’d love to take advantage of it for our game, but it is not as straightforward as it might seem.

Besides the Wii U, we are planning to release on Steam and Xbox One as well. Our hope is get on to these platforms within an year.

Be sure to check out the full interview that goes into more detail on the development team and more.

Source