Seil Jeon got a IETF RFC titled "Multicast Mobility Routing Optimizations for Proxy Mobile IPv6" as Experimental status, by collaborating with InterDigital Communications LLC, Telefonica I+D, UC3M, and Soongsil University.
This draft proposes some experimental enhancements to the base solution to support IP multicasting in a Proxy Mobile IPv6 (PMIPv6) domain. These enhancements include the use of a multicast tree mobility anchor as the topological anchor point for multicast traffic, as well as a direct routing option where the Mobile Access Gateway can provide access to multicast content in the local network. The goal of these enhancements is to provide benefits such as reducing multicast traffic replication and supporting different PMIPv6 deployment scenarios.
The RFC can be found here: http://tools.ietf.org/html/rfc7028
