Just an FYI. All HD broadcast via OTA, Satellite, or cable must be digital because that is the HD spec, but not all digital has to be HD.
For the last several years we have been telling people that when the changeover occurs it will not change much for how much HD content we have because of that FYI above. I believe/hope that now that the digital changeover has occurred that it makes more content make the bext transition from digital SD material to HD material, but it will unfortunately take a long time for that to happen. Some content providers updated some of the digital equipment to HD quality equipment as part of the changeover I am sure, but most likely just got converting equipment to convert the analog material to digital material, and is still in SD.