Hi OSIAS,
Yes and no…means that even if there will be a tool from Epic it will concern only the rigging part, not the actual export, because even the ART rely on FBX in order to export the rig.
UE4 rely heavily on FBX, so even if Epic will release a custom tool for Blender it will still use FBX as the export method…to create something unique just for Blender I don’t think it will be a good idea, because it will reduce the possibility of file sharing and assets.
In the end the ART is a rig builder, who uses 3ds, cinema 4d, Modo and so on are using FBX as everyone else, so I think that the best solution would be first to optimize the FBX export from Blender, then thinking about the custom tool from Epic.
If Epic guys will take care of it…well…great!