Some... rather short eShop maintenance for next week. Just rebooting the servers?
Wii U: Nintendo eShop (all online services)
Nintendo 3DS: Nintendo eShop (all online services)
Web: buying games from the Nintendo Home Page (all online services) [Japan-only]
It will take place on:
Europe: October 25th (12AM to 1AM)
UK: October 24th (11PM) to October 25th (12AM)
North America (EST): October 24th (6PM to 7PM)
North America (PST): October 24th (3PM to 4PM)
Japan: October 25th (7AM to 8AM)