If you have tried to log into the Nintendo Network anytime since yesterday you probably have been unable to. The service was taken offline after being completely overburdened under an influx of new users, no doubt due to the amount of Wii U and 3DSes found mysteriously under dead decorated plants in homes yesterday. (What was that all about, anyway?)
After a whole day the service still is barely usable, if at all, with error messages instructing you to restart your entire system (!) and try the service again. It usually works pretty well, new users, and hopefully you'll be able to get to the eShop soon, because there's a number of good downloadable games on sale right now. That won't help your multiplayer matches now though, which are pretty much unusable. Just play through the single player components of your new games because you run the risk of games dumping out on you until the issues are fixed.
But Nintendo is trying to help out, and to do that they have temporarily pulled the Pokémon Bank from the Japanese Nintendo eShop. That add-on to Pokémon X/Y went live in Japan yesterday and was set to go up in North America and Europe tomorrow. This app allows you to move Pokémon from Pokémon Black/White and Black 2/White 2 into Pokémon X/Y and as you can imagine it's quite popular. Given that the game is the most popular among all the games pulling the app might help the server load, although as of this writing connecting to the Network is still almost impossible.
Nintendo hasn't given a return date for the app so you might have to wait even longer, but then again, if the service isn't running right you probably don't want to start up a subscription to the Bank anyway. The app is free for 30 days but it's $4.99 a year after that.
So while this is bad PR for Nintendo's servers it's good PR for Nintendo, who undoubtedly sold a ton of new systems. How many of those were Wii Us, though? We all know the 3DS is performing exceptionally, easily besting the Vita, but the Wii U is the problem area. We'll let you know sales figures as soon as we hear them.