I think it's still a bit premature to think so far into the horizon, but I guess it makes sense for broadcasters to be thinking about it:
Ultra HD Is being touted as the eventual successor to the high definition resolutions we have at home today â€“ most commonly 720p and 1080p.
The BBC and Japanese broadcaster NHK teamed up earlier this week to run an experimental broadcast showing Ultra HD's potential. It could be the next big thing in TV.
What's the big idea?
Ultra HD increases the resolution of broadcast TV and movie video by an order of magnitude way over what we can see today with 1080p flat panel displays.
Rest of the article available over at TechRadar.