They have a couple cards with drivers for XP Media Center Edition. I have been trying for a month to find price and availability since I saw the press release. I know there are a few others that are interested in this info as well. I finally have found a source and they have confirmed availability/ability to ship.
It looks like there main market is large OEM's. There price is anything but competitive. I really would like to try it but am a little gunshy due to the price. If there are any other brave soles who would like to give one a whirl and report back that would be great.
Hope it's ok to post the supplier (which I have absolutely no affiliation with). Innotechusa, list price is $335 but they knock about $30 off.