Analysts believe that UltraHD will delivered via online mechanisms before the like of cable or satellite. This is probably due to MPEG-5 being easier to implement on a software based device with its GPU than a device that has a chip to do the decoding.
Comcast did announce at the "Cable Show" that it was working on Ultra HD and did do some demonstrations using DOCSIS 3.0. However, like the 2gb transfer speeds that were also announced at the "Cable Show" it is hard to know what was smoke and mirrors. Like the early HD codecs, it was easy to show 1920x1080 resolution for a video that didn't have much moving in it.
What is interesting is that Comcast said at the show that they would be ready for 4K "if the market develops". With the failure of 3D on broadcast providers like Comcast, the recent announcement from ESPN that they would be dropping their 3D channel brings up an interesting point on if anyone will have the appetite for 4K. Given that 4K really needs a display that is more than 60", will the majority of people even notice?
One note is that Netflix announced that they would deliver "House of Cards" in 4K.
To end, common wisdom is that it will take 5+ years for 4K to get mass market adoption. I think that term is overloaded as one could argue that 3D has mass market adoption based on the HDTV's that ship have 3D. However, that doesn't equate to consumers actually using 3D technology.
While I couldn't wait for the current HD format, at the moment I am less than enthralled with 4K, or 3D for that matter.
What do you think?