Maris on 25 April 2013
From Nintendo's website:
Extended Maintenance
From Thursday, April 25, 2013 5:00 PM - Thursday, April 25, 2013 7:00 PM Pacific Time
Affected Services:
Wii U
- Nintendo eShop
*During the extended maintenance, parts of the affected services
may be intermittently unavailable.
( http://www.nintendo.com/consumer/network/en_na/network_status.jsp )
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I'm assuming that this is in preparation to the update, and it'll be available afterwards. Just a guess though.
