Sony's major Mobile World Congress product reveal turned out to be the very same slate it had already taken the wraps off of this past January in Japan: the Xperia Tablet Z. Now that the 10-inch Android tablet's been officially announced for global availability, it's time for it to start trickling out to market and (surprise, surprise) Japan's getting first dibs. Starting March 9th, NTT DoCoMo will begin accepting pre-orders for the LTE-enabled tablet (in black or white) with a general launch date set for March 22nd. There doesn't seem to be any indication of pricing as of yet, but we've seen figures that indicate this region-specific Xperia Tablet Z could retail for around ¥85,470 (about $900 USD). If you like what Sony's done with this waterproof, Jelly Bean tablet and you live in the Land of the Rising Sun, well then you know what to do. For everyone else around the globe, there's always the vague promise of a Q2 launch to cling to.