Not that it matters because it seems nobody on here has NHL GameCenter, but here is the response I got from the today about the Sabres broadcasts.
Unfortunately, MSG-B still will not provide us with an HD feed for Sabres broadcasts. The main MSG channel (which typically shows Rangers games) is in HD now, but the alternate MSg channels (MSG+, MSG2, MSG-B) are still sending us SD feeds for their telecasts. Our network operations center has been in touch with the channels regarding this issue, but no resolution or estimated time has been given.