Friday 12/23/2016 build 14997 x64 Enterprise
leaked to the internet.
I downloaded & installed it yesterday on test rig 2 in VMware 11.1, the install went fast (45 minutes) even though I only allocated 2GB of memory to the virtual drive.
Had a problem when installing the VMware tools though.
As with all leaked builds, you should be very skeptical of installing this. Keep in mind that there's a reason that it wasn't offered to Insiders, and it could cause your system to be unstable. In fact, you might even have to do a clean install with an official build in order to continue receiving new ones.