Jeff, as near as I can tell suhd is just a marketing catch-phrase use by Samsung to denote certain high end models with improvments to the display technology.
http://www.cnet.com/news/what-is-samsung-suhd/
It is NOT a new broadcast system that has anything to do with repacking the tv channels, just a marketing phrase to differentiate thier product from the "rest of the pack", much as US manufacturers used phrases like "NewVista" or "Chomacolor" in the past.
jr