We are waiting for vendors to ship...

Stabilized IPv6 implementation

Multicast by IPv6 PIM
Waiting for vendor routers support, as we need all routers to speak PIM
OSPFv3, eventually
Again, waiting for vendors to ship/stabilize it
IPsec for protecting routing protocols
No vendor support at all at this point
Details are lacking in RFC - "use IPsec" is too vague
MLD-snooping L2 switches
IPv6 multicast traffic leak out from all ports!