The extended maintenance is scheduled between 1PM PT today (4PM ET, 9PM UK) and 7PM PT (10PM ET, 3AM UK). The eShop and shopping channels for the Wii U, 3DS, Wii, and DS will be affected, so expect them to go down during those hours.
http://www.joystiq.c...i-u-system-upd/
Oh found another website saying its out today!
http://wiiudaily.com...irtual-console/