I downgraded to HD Standalone pack yesterday and they told me I could not have any sports subscriptions or RSN's. You will get public access channels, premiums including any SD version, and adult subscriptions.
I had center ice this past year and I also watched soccer on voom wordlsport, FSC, and GOLTV so I sacrificed a lot to get this HD only pack. But I figure I'll have a lot more time to do other things now. My bill went from $120 to $60 so I'm very happy. Between NHL games on HDNET, VS, and NHL net, there should be an HD game almost every night during the season. I can live with that.