I updated BIOS from 2.10 to 3.60 just to have support available in case I switch to Broadwell-E sometime but two problems appeared:
1) When I turn off the system normally (fast startup disabled) and decided for whatever reason to pull the plug or have a power loss the system will auto turn on when the power returns and will remain on for about 10 sec until the moment it should start loading Windows, then it will turn off and stay off. The next power on it will open to the BIOS screen and I must restart to enter Windows normally (BIOS is set to remain off if a power loss occur).
2) Now whatever setting I change to the BIOS or even just choose discard changes and exit the system instead of restarting, it powers off and on.

I have noticed same behavior on a friends X99 Extreme4/3.1 system.