Recently they added an export to obj option. I originally started using that for my test of world composition but then I saw the LOD option in UE4 that does it for you. One nice feature if you want all your tiles to have the same height at their edges is you can set an area to cover only the edges and blend any terrain into that edge. Then assign an imported flat heightmap to that area or paint it or use the flatten filter and then export to obj.
You can also just do the same thing in a paint program on he outputted heightmap though and then generate your meshes within which ever 3d modelling software you are using to convert to static mesh.
Tiling is a very important feature and should be in the RC. I think they announced 2-3 more beta before the first RC.
They’ve just added sliders to change the origin in the heightmap and are working on unlimited terrain size (not GPU bound) for the next release. These should be precursor to tiling.