Armature Studio which is handling the Wii U and Vita ports of Bloodstained stated they are working on getting the Unreal Engine 4 to run on both platforms. The plan is to get the customized engine to work on those platforms and then release the source code for free so that other developers can port their UE4 games to both platforms.
Only downside is the source code won't get released until some time after the game's release (early 2017).
Quote:
“Hi Bloodstained backers - Armature here with another update. It turns out that a people have shown a ton of interest in our plan to port UE4 to the WiiU and PS Vita. Since they're not officially supported platforms, it's going to be a lot of work to get Bloodstained and UE4 on these platforms, but we are up to the challenge.
“Since the community got these platforms off the ground, we figure that it's best to let the community have them back when we're done. As a result, after the release of Bloodstained we will share, for free, the UE4 WiiU and Vita code with any developer authorized to develop on those platforms! Thank you all very much for this opportunity!”
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https://www.kickstarter.com/projects.../posts/1259255