There is UHD-1 (4k) and UHD-2 (8k). For the flat panel manufactures, 4K seems more than adequate. But they have large product development budgets and can turn out "the next big thing" in fairly short order. The projector manufactures and various light engine technologies require a longer development cycle due to the smaller scale of the two-piece projection market. Hence the logic for them to skip UHD-1 and go directly to UHD-2. As for content delivery, the NHK has already demonstrated several schemes for transmitting UHD-2, including over the air.