According to TWC's FAQ regarding the new genre-based lineup, the distinction between HD and SD channels in the lineup will disappear, with both being assigned the same channel numbers:
Where can I find High-Definition (HD) channels?
The new lineup is no longer broken up by HD and SD channels. HD converters will show you the best signal available of a channel or program, which is usually HD. SD converters, meanwhile, will show only SD channels.
What this means is if you tune to a cable channel that has both HD and SD feeds avialable on the cable system, HD boxes will tune to the HD feed, and SD-only boxes and DTA's will tune to the SD feed, something like how ke4pym's got his DirecTV program guide set up, except that the SD duplicates will be "hidden" automatically on HD boxes (and HD dupes on SD boxes) without having to change any guide settings.Edited by blackcap93 - 1/11/14 at 4:15pm