How to configure IPv6 Load Balancing? (PCC, multiple ISPs/GUAs)

Is there an overview available somewhere of known issues? Maybe I’ve just missed it but if not, it sure would’ve been nice to know this…
Or even just a list of core things that work in IPv4 but not yet in IPv6? I do know they had one of these i.r.t. hardware offloading but, afaik, not on core functionality.