https://forums.unrealengine.com/showthread.php?94470-HammUEr-a-Hammer-Worldcraft-map-importer-for-Unreal-Engine

Been watching this develop on Twitter, looks like they're finally hitting prime time. Convert HL2 and later map formats into UE4 - and they do specifically mention that using Jackhammer and Hammer you can get Quake maps. (Somewhere in the Twitter account you can see shots of e1m1 in UE4).