::::::::*Based on a plain Google search results for "ultra high definition television" I can see that there are a variety of ways it is hyphenated. Wikipedia:COMMONNAME states though that the most common name should be used and from what I have seen that is the term decided on by the CEA. I have presented a large number of links in support of that as well as the CEA press release. You have said that you dislike marketing terms but that is not a valid reason to ignore the CEA which is an organization that represents over 2,000 companies.