Eh, no. This happens sometimes. It is impacting all Battlenet games. They do have a notice up in the Launcher as of about 45 mins ago, and on the Twitter CS page.
They are working on it and will have it up as soon as they can. How long though? No idea. They did not give an ETA.
[#Bnet] We’re currently investigating an issue affecting our authentication servers, which may result in failed or slow login attempts.
No, that is not what the notice says. They acknowledge an issue on their end and are working on fixing it.