Originally Posted by CharlesH
If this is what I think it is, it is a standardization of channel ranges for different kinds of content, and assigning the HD version of an SD channel as the SD channel plus an fixed offset. Since the channel numbers have nothing to do with the frequency which carries the channel, there is no problem for the channel assignments to be sparse.
I don't think it's the reorganization as only the 10 or so new channels are being added above 1000.
My area recently went 100% digital so they are adding some of the "niche" channels in HD. Channels like BBC America HD, Oxygen HD, C-SPAN HD and Fox Soccer Channel HD, among others. Personally I've been waiting for BBC America HD for over a year and am finally getting it. I'm also getting The Hub HD which I want. With this update, all the channels I watch will finally be in HD.