I’m really excited about this! We’re a Maya shop, technically speaking, but I use personally use Blender for prototyping assets and the like (the art team won’t let me create “real” assets anyway 
).
Honestly, I’ve had great luck going from Blender to UE4 ever since 2.72 with the new exporter with characters I rigged in Blender (either to the Rigify skeleton, or to the skeleton), but I still haven’t been able to come up with a good workflow for rigging assets to the Epic skeleton or creating animations for that skeleton.
If at all possible, please please please cover that process.