Hey, Unreal Engine 4 Community!
They Blender user Richard Nagy released his Erosion add-on for the Blendermarket: Erosion Add-on. This way, it’s easy to create pretty realistic and textured landscape within minutes just inside Blender. The result may then be exported as a heightmap and shipped to any major Game Engine.
For any further information about the tool itself, the author released a video a couple of pictures of the tool and its results:
Happy day!