Not only that, they have dropped one of the Center Ice HD channels. Channel 626 has only an SD version in the program guide, while all the other 600 series channels have an HD version as well.
Last week, Boston was on 626 (the SD version) with no HD version. However, I did find the HD broadcast in the 9000 series HD channels. Today, however, there was no HD version of NESN on either channel.