The last we heard, Samsung's Galaxy Tab 2 10.1 was in pre-order limbo at Office Depot. Now we have official word that the slate will launch at that outlet -- and also at Amazon, Best Buy, Tiger Direct and others -- on May 13th. As expected, the 16GB WiFi version will go for $400, and if you've followed our coverage, you'll know it's a solid dual-core slate that nonetheless doesn't make huge spec improvements ov