To the surprise of absolutely no one, Wii U is a region locked console. This information comes via a translated tweet from well known Japanese gaming magazine Famitsu.
"What can be played on the Wii U is restricted by a region-lock feature; software not sold in the same region cannot be played." - @Cheesemeister3k
Region locking has been a thorn in gamers' sides on nearly all of Nintendo's consoles, the only exceptions being the Game Boy and DS handhelds.
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Wii's World is not officially affiliated with Nintendo! (but they wish we were).