Another very interesting Internet Draft was posted today:
http://tools.ietf.org/html/draft-ietf-l3vpn-2547bis-mcast-10
In todays MPLS VPN networks, multicast isn't natively supported, but there are some duct-tape workarounds to get it to work (MDT with GRE). Finally a more permanent solution is coming, albeit at the cost of some pretty complex functionality (luckily only in the SP network).
A bit of a long read, but there is some interesting info contained within if you can keep up with the theory.
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