BBC tests 4k with three World Cup matches

From BBC News:

Three World Cup football matches being played in Brazil this summer will be streamed in ultra high-definition (UHD), the BBC has announced.
The format, also known as 4K, offers four times the resolution of 1080p high definition video. The matches - including the quarter final and the final - mark one of the first times a live event has been streamed over the air in UHD in the UK. Previously the BBC has worked with Japanese broadcaster NHK on such trials. Rival broadcaster Sky has also run 4K trials. The live streams will be distributed via satellite, but only to a handful of UHD TV sets in selected BBC Research and Development facilities.