I had a chance to test BT3 (USB) on a 3680 while I had it for a month:

Boots perfectly with no extra parameters, Audio seemed un-supported but I had no time to tinker.

Internal wireless card (BCM 43xx) supports injection with no extra drivers or parameters, decent signal rates, I'll get the exact card number in the next few days.

Otherwise everything seemed operational and no flaws popped up.