Just downloaded 2.8 on my Galaxy Nexus but it's still having trouble paring with my existing wallet. After I scan the QR code it says 'Failed to decrypt wallet. Password may be incorrect'.
It's working now. Turns out my wallet account was old and was still in some old format or something. If anyone else is having this same problem, open up your wallet in your PC browser and go into account settings and then run the integrity check. After the check (which was valid for me), pairing worked.