Those of you running WSUS should check your synchronization logs... you likely have a nice surprise.

The first Windows Defender Beta 2 definition update is now available. This 1.6MB download will bring your newly downloaded Windows Defender spyware definitions up-to-date (version 1.13.1272.4). If you don't see this download in your list of available updates, check your Options | Sync Options | Update Classifications for a category called Definition Updates. Check this guy and re-sync. That will get you on your way. Enjoy!