FSNE HD is on channel 96, but I only saw the first two games on. Only the Celts home games are in HD.
I wouldn't get your hopes up too much about NESN HD being fixed, someone on another site reported that after the 1st half of the last Bruins game, the second half had the 8mm effect again. I can't confirm this, as I only watched a few minutes of the game. By the way, as of yesterday CBS and NBC HD still didn't run smooth.
At least it sounds like they are working on it. I will be very happy with DirecTV once they fix this problem.