There were h.265 demos last year at NAB as well as CESI'm not sure how it's assumed current UHD displays would have h.265 decoding. Aside from OTA, decoding is usually done by an external device. ATSC 3.0 is still in an experimental stage. Hardware decoding allows inexpensive outboard devices. HEVC should be in mobile devices before too long. When the next step of encoding is standardized upgrading may be simpler than it is now.
4/24/14 at 5:11pm