From the interview with the gentelman from the NAB show that Scott Wilkinson did , the guy mentions that data doesn't seem to be an issue with UHD on a disk it's more about the other details like, what gamut, bit depth etc will be used for the specs. It could take a while maybe even years to hammer this stuff out. The committee consists of manufacturers, friends, competitiors and lawyers, imagine being in that room. The other thing is manufacturers of displays would have to figure out ways to get to this new gamut of rec 2020 and higher bit depths within resonable prices for the consumers. From what I know is that HDMI 2,0 already supporst Rec 2020, 422, 60fps and 12 bits. What we don't know is if this is what the nextgen UHD bluray will have as the spec. I really hope they don't keep Rec 709 , 4:2:0, 30fps and 8 bits. Better pixels over more pixels.