Hello,
TMBK, there is no such thing as dynamic peer discovery in IPv6 BGP. I have searched through the RFC´s but no mention of it either. I can imagine that the Neighbor Discovery Protocol could take care of the IPv6 address discovery, but not of the mapping of addresses and AS numbers...
Obviously this is not a definite ´yes´ or ´no´ answer, have you been able to find out something yourself meanwhile ?
Regards,
GP