Well that's odd, now it's listed as deactivated and out of stock. Surely they didn't sell out yesterday, or did ASRock jump the gun?
From a quick Google, it seems that this is one of the first Sandybridge mobos to make an appearance at a retailers website. Prolly a pre-sale item. Newegg has the listing up in preparation for the board getting into stock.
Get ready everyone, HERE COMES SANDYBRIDGE!!!!!!!!!!!!!