UHD - Ultra High Definition also known as 4K for television. Actual 4K is a little higher res than UHD. In laymans term These channels will have 4 times more clarity than a full HD channel. Currently none of the channel is available in UHD in India. Tata sky might launch just one channel by itself to cater UHD audience. You need to buy a UHD tv and UHD set top box to get view this service. I expect the service to be pay per view, no idea on pricing.