The link is to a Charlie Demerjian rant at The Inquirer. Rant is the right word, too.
It seems you are not going to be able to build an Intel "ViiV" platform on your own, though there are a huge number of components that say they are compatible and apparently a lot of folks are buying them with the expectation of building a machine to the "ViiV" specs. The reality is that to be ViiV compatible, you're going to have to buy an OEM machine. If you build, you will at best be in violation of the MS EULA and at worst won't be able to get the desired functionality.
More to come on this, I'm sure.