Looks like the SABRES HD channel has been added to channel 1710, but when I tune to it it's just the On Demand preview channel. Guide says SIGN OFF until 6:30pm when the Sabres pregame starts.
MSG Plus is airing the Sabres game in standard def tonight, but the high def channel is carrying the islanders, creating the need for a separate HD channel for the game. I guess this has been coming for a while, but I see other cities have had this separate channel for a while and it's nothing new.
They also added Team2HD - Team 9 HD on channels 1901-1908, and Game 3-Game9 HD on 1921-1927.
Ch. 1800 hi-def movies have moved to channel 2/1010 as promised.