I guessed it! The latest Samsung Galaxy S8 Oreo Beta 3 update is now available to download.
Go to your Settings -> Software Update and check for updates to initiate the download.
It comes in at a hefty 623.19MB and includes November’s security patch along with Bluetooth stability improvements.
The full list of updates/improvements haven’t yet been added to the Samsung Docs site but should be available here when they have: http://doc.samsungmobile.com/SM-G950F/BTU/doc.html
The update list is now below, it was available through the Samsung Members app