Actually, if you've read up on LDT (or HT as it's called now), you would know that it isn't merely marketing hype. There are many confirmed users of the bus already (INCLUDING NVidia, it has been confirmed from multiple sources over a good deal of time, that they will be using it for the Xbox hardware), and a great deal of others are currently investigating using it.
However, one interesting comment by an AMD PR guy is that, the volume of chips that MS would require to have an AMD CPU in the Xbox, is so large that they would effectively have to stop creating chips for the PC market to create them for the XBox. Intel has so much more capacity that this isn't a problem for them.