Having this issue as well. (Just got the early-access today)
Windows 10
i7-5930K
32GB RAM
2x EVGA GTX 780ti Classified in SLI
Nvidia Driver 361.43
Freezes completely after a short time, audio still plays. The first time I was able to get out of the game and kill the process - Windows had reported the display driver had crashed and was restarted. Since that first freeze, I have been unable to recover and needed to use a hard reset. I have submitted crash reports on this, but I'm not sure I want to keep trying until I can identify the cause and stop this issue - hard resets can cause issues.