Yesterday Nintendo launched a maintenance period for the Wii U and 3DS eShops (DS and Wii also affected) with a 24 hour period warning. Very little information was given on the maintenance page about why this period is taking so long, but according to a Japanese tweet that has been translated, it’s because Nintendo is replacing some server hardware for these services.
11月2日（月）正午から、ニンテンドーeショップなどのメンテナンスを行います。今回のメンテナンスは大規模なサーバー交換を目的としており、最長で24時間かかる見込みです。メンテナンス中はニンテンドーeショップをご利用いただくことができませんのでご了承ください。
— 任天堂株式会社 (@Nintendo) November 2, 2015
While that’s pretty routine maintenance, we don’t expect to see anything new once the eShop finally comes back up, other than some new music for celebrating the upcoming release of Yo-Kai Watch perhaps. Either way, you’ll have to wait until late in the evening tonight to explore the Nintendo eShop again. Servers won’t be up until 7pm PST/10pm EST.