I'm a fan of what you've done there. I think we have the same design as Germany's (in the UK), and while I like it, there are some elements that are hideous (well, I say "hideous," but that is an exaggeration, as I long for a more "Metro" design), most notably the images they've used for the links to their Facebook and YouTube pages, located at the bottom, along with the image used for the link to sign up to their newsletter).
Some of theirs looks somewhat "Metro," while some of it doesn't. Your mock-up certainly looks a little bit more "Metro."
One suggestion I have is for you to make the Xbox logo monochrome, like most of Microsoft's new logos are. Microsoft's new "Metro" logos tend to be white on a different colour background, though, so that could mean your design will require a different background colour to white. Either that, or possibly just a green block around a white Xbox logo (a bit like how a wide tile looks on the Windows 8 Start Screen). I'm not sure whether that would work well or not, though.
p.s. Welcome to Neowin