Since lightmass use CPU+RAM to build lighting in a scene, I hope one day some company will open their farms for Unreal projects. Think about it, hundreds of pc building your scene Incredible quality scene built in minutes!!!
This would be even be easier to setup than GPU renderfarms and the software is free. It’s not like they have to install a bazzillion vray+max licenses!!!
I will investigate more this way http://gofreak.tumblr.com/post/87018936015/unreal-engine-4-developing-in-the-cloud. Running ue4 on an amazon instance is one thing but distributing the building on multiple amazon instances is another! That would be great. Multiple Xeons working on a scene at the same time