I don’t have much experience getting UE loaded up so this is a first for me - Windows 10, Oculus DK2 with 0.7.0 SDK/drivers, and I seem to be getting stuck at the “Loading…95%” screen. The Oculus positional tracker is kicking on and…well look at that…it just loaded. LOL So yeah, give it some time folks. 
I’d say it took about 10-15 minutes of processing for the shader compilation to complete.