Even if Seiki would start producing some kind of HDMI 2.0 kit where will you get a source of 4K@60 from HDMI 2.0 output??? The first company starting producing a proper HDMI 2.0 chip is Silicone Image announcing it a month ago...
The "HDMI 2.0 solution" in the last Sony and Panasonic TVs is a fake basically applying HDMI 2.0 specification on a chip with HDMI 1.4 bandwidth: basically they are sending 4K@60hz but with color degradation/subsampling of 4:2:0.
i am not so sure about future HDMi 2.0 chips allowing pure RGB or 4:4:4 in 10bits or above, because the HDMI spec does NOT include these modes, Under HDMi 2.0, if you want RGB or 4:4:4: you are by spec definition limited at 8bits color modes. That has been the subject of articles. The sony link you provided actually states4k60Hz 4:2:0 8 bits, which, while not fully complaint with HDMI 2.0. is at least a mode unavailable for HDMI 1.4b users.
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