Sanjay Jha and various leaks already told us as much, but here's the official word: the WiFi-only Motorola Xoom is launching on March 27th for $599. Retail availability will be truly widespread, with Amazon, Best Buy, Costco, RadioShack, Sam's Club, Staples and Walmart all offering up the Honeycomb tablet. Other than the omission of the 3G and 4G radios of the original Xoom, you're basically looking at an identical hardware package. That includes a 1GH