They're not. They put up a pre-order page, then dicked about with the price (first £660, then £720, now 'TBC');
Tech Radar picked this up, turned it into 'news' and lo! traffic is driven all around...
The Xoom's a nice-looking piece of kit; worth noting though that the demo units at CES were apparently just running a video of the OS, so not quite the full interactive hands-on experience some journos and bloggers might be leading everyone to believe.
Colour me skeptical, but I can't help but think that if they were bringing this to market at iPad money or less, they'd be screaming it from the rooftops. We'll see.