Nintendo is performing online maintenance for all its systems today as it prepares the Wii U's spring system update. The update, which will introduce the Virtual Console proper (among other things), may be fully launched by tomorrow according to a Facebook tease by Nintendo of America.

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.