Microsoft has provided a list of what's been fixed and what is broken with the just released Windows 10 PC preview build 14267 for members of the Fast Ring of its Windows Insider program.

Here's a list of what is fixed in this preview build:

  • Choosing "Reset This PC" under Settings > Update & Security > Recovery should now work as expected.
  • You should no longer see a WSClient.dll error dialog after logging in.
  • The front-facing camera should be usable again on PCs with Intel RealSense cameras and you should be able to use Windows Hello again.
  • We fixed an issue where incorrect storage capacity was provided for the system volume (the hard drive in which Windows is installed on) under Settings > System > Storage.

As far as known issues with build 14257, there is just one bug:

If you're using Hyper-V and upgrade to this build with more than one vswitch or have multiple virtual networking adapters (including legacy), you may lose networking connectivity after upgrade. To get network connectivity back, there are two workarounds available:

  • Remove all the virtual network adapters connected to the vswitch, delete the vswitch and recreate it, then reconnect their virtual NIC to the new vswitch.
  • Admin command prompt, do "netcfg -d" will wipe-out all the vswitch settings so that you can start from scratch.

Source: Microsoft