Hey,
Leap Motion is a really interesting piece of hardware for sure. I might just order one myself just to mess with it. I can ask about adding it to our plans, but it would still be a long while before we would be able to make it compatible with UE4. I’d suggest developing a plugin for it for if you want to use it now.
Also, if someone were to make a plugin for it, we would be able to more easily integrate the technology.