No offense to Nintendo fans but I hope it doesn't get a Wii U release because of the impact it'll have on the other versions.
With the Wii U being the weaker console, it may hold the other others back in performance or graphical fidelity. With PS4, Xbox One, and PC running on the x86 hardware, cross platform development won't be much of a cost, but with the Wii U, a lot of money that could go into making a better game would go towards that. Even the possibilty of the publisher wanting a specific release date, rushing them to finish all versions and we end up with day one patches, bugs, etc.
So more people playing the game is good but not if the games quality suffers because of it.
*edit*
Also, a lot of posts seem to be uninformed thinking it won't be much of a difference by including the Wii U version. Bloodstained isn't going to be 2D. The gameplay images are just concept art. If you read the kickstarter you'll see the game was announced a a 2.5D title. So it'll have the same style of graphics as Dracula X Chronicles and Lords of Shadow Mirror of Fate.
https://www.youtube.com/watch?v=gw5sE0eqDdU
https://www.youtube.com/watch?v=QUOK3DRI0_g
