We have been working on a collaboration tool that should speed up the level building process. It has been in beta for a bit of time now. I was showing the pre-beta to people at Unite 2015.
I’m looking for people who are in the world building process right now who would be interested in joining the beta. PM me for more info!
Ha good point - It seems this message went out before it was complete. We in essence have a service that enabled interactive, multi-user world building in Unity - like google docs. It is being used by a small handful of companies right now, and I would like more companies to join to help us find the issues and give us feedback.