Looks like the stylesheet/settings are broken for the front page. When I open the forums/etc everything is back to normal (the dark/old theme) but the news page has the light/new one.
Not showing up correctly for me still, tried using both the latest versions of firefox and opera, screen resolutions tried were 1280x1024, 1600x1200, and 1440x700.
It's an advertisement. Sometimes they use a forced background on the main skin, which forces the main site to default to the new WoW skin style, it goes back to the old style once you get deeper than the first page.