There's another possibility. Wal-Mart being Wal-Mart, they're large enough to get unique print runs from USPC - they've done it before for plain, run-of-the-mill Bicycles, getting a unique two-pack that was their exclusive product. This could be another case of Wal-Mart using their clout and buying power to order an exclusive tuck design to get Mavericks in their stores.
Are the quality any better than the usual? Mavericks have been Chinese-made and the lowest-end deck for USPC for a number of years now. I typically only see them selling at dollar-stores, usually with a 99-cent price tag. They're barely worth that.