HI everyone,
I just put together a quick tutorial on how to setup a basic rig with blendshapes, animate that blendshape with a controller and export everything to Unreal 4 so you only get just the bones and blendshape and not all the controls that are converted to bones in Unreal.
https://www.youtube.com/watch?v=iTFTm0cUMyg&feature=youtu.be [www.youtube.com]
Hope it helps.
Cheers