It's not "the new Ultra HD", it's Digital Cinema 4k, which is 4096 x 2160, or roughly the equivalent of a 2 by 2 matrix of 1080p displays (and exactly the resolution of a 2 by 2 matrix of Digital Cinema 2k displays).
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It's not "the new Ultra HD", it's Digital Cinema 4k, which is 4096 x 2160, or roughly the equivalent of a 2 by 2 matrix of 1080p displays (and exactly the resolution of a 2 by 2 matrix of Digital Cinema 2k displays).
See the following illustration for clarification:
http://en.wikipedia.org/wiki/Image:UHDV.svg