So I finally got around to finishing my new built. I've been sitting on parts for months.
I enabled Bluetooth (BT) in the BIOS. I load Windows 10 Pro x64 (latest build), enable BT in Windows and enable BT discovery in Windows - all important steps. I then try and get the R5E10 to see my new Xbox One controller over BT (yes, the latest controllers supports BT). Nothing. Absolutely nothing - I can't get the R5E10 to see jack over BT.
Looooong story short. For the hell of it I enable wireless on the R5E10 via the BIOS, which was previously disabled as I had no plans to use it, and I attached the included WiFi antenna. I didn't install any new BT drivers or change any BT settings in Windows. Guess what... the R5E10 now sees my controller.
This is nuts. I don't know how or why BT is "connected" to WiFi on the R5E10, but it should not be.
Hope this helps someone else. I Google'd this for quite awhile last night and came up with nothing.