John Zubrzycki at the BBC was responsible for the 8K broadcasts during the London summer olympics in 2012. He has both written about his experience and held a presentation where he explains how the BBC did recording, post-processing and transmission of the TV signals. They used equipment from NHK that is also being used in this new upcoming trial.
http://www.bbc.co.uk/blogs/researchanddevelopment/2012/08/th...
http://www.fxguide.com/fxguidetv/fxguidetv-167-cvmp-hi-visio...