Nintendo has put out a post on there official Japanese support site announcing the closure of Miiverse. After data-miners found stuff suggesting that Nintendo would in fact be shutting it down this doesn't really come as a surprise.

Link to the official post.

A translation of some of the text that I got from the Nintendo Life website: Link to the post from Nintendo Life (Note they used google translate so...yeah.)

We are pleased to announce the launch of "Miiverse (Miverse)", a service that connects customers all over the world through games, launched on Wii U on December 8, 2012, on November 8, 2017 (Wednesday) I will end with it.

"Miiverse" service end date and time

Wednesday, November 8, 2017 15:00 (Japan time)

I am sorry for the customer who used it regularly, thank you kindly acknowledge it.

In addition, with the end of the service, you can download the service of your own post (* 1) you can download to "Miiverse"

We will offer for a limited time at the web version "Miiverse". Details will be announced within "Miiverse".

Thank you very much for your patronage over the long term.

It's kind of sad it's coming to an end. I actually really enjoyed Miiverse. However, I imagine it was really resource heavy for Nintendo to maintain, so it's probably for the best. In any case, we can remember some of the great posts on Miiverse.

FUCK'EM !

You beat me to it by a couple minutes, but I think my post on this topic is a more healthy conversation on this topic:

https://www.giantbomb.com/wii-u/3045-139/forums/miiverse-is-shutting-down-1813694/#9