Dave's MAST proposal was announced at http://www.ietf.org/mail-archive/ietf-announce/Current/msg25938.html.
It is not entirely clear where this draft should be discussed. I bailed and sent my comments to Dave offlist, and asked him to reply on SOME list if my comments were helpful (candidates include MULTI6, but I can't speak definitively). I'm sure guidance would be graciously accepted.
Similar stuff has been discussed on the multi6 list in the past, so I see no reason why this couldn't be discussed there. Doing so isn't even in direct contradiction with the charter. :-)