Pair up two fire teams. If you have a 3 man team, have the option to join another group. It's the halfway point between traditional matchmaking, and the current option.
I explained it in this post
http://www.bungie.net/en/Forum/Post?id=67170274
This one does a better job
http://www.bungie.net/en/Forum/Post?id=67168788
English
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For some reason those links don't take me to your threads. Could you possibly re-link them?