For what it's worth, this is the info posted on the FSN New England site:
http://fsnnewengland.com/FSN HD.jsp
DirecTV lists FSN New England on their RSN HD page, and when I put in my zip code it says the Celtics are available in HD.
http://fsnnewengland.com/FSN HD.jsp
DirecTV lists FSN New England on their RSN HD page, and when I put in my zip code it says the Celtics are available in HD.