4K TV will require a lot of data.
Yes it will. But the trials that have been done in Londen with the Olympics and in Japan aren't compressed as good as they can be. 4k resolution in essence is the same is 4 screens of 1920x1080 combined, so in theory is MPEG4 is used, a 4k channel could be configured to be more or less the same as the current usage of 4 HD channels, which with new satellites with increased capacity is something that can be overcome.
Also, I would imagine that with new technologies being released over the next 3-5 years (realistically, I don't see the launch of 4k channels to be somewhere after 2016) the compression without visible loss of quality might be increased a little more to the extend that a CURRENT transponder, capable of doing 6 HD, or maybe even 7 HD, will be able to handle 2 4KHD channels without loss of quality.