Miiverse is ending in 2 months and 1 week, aka November 7th.
I mean, we all saw it coming.
Things that will be changed:
SUPER MARIO MAKER -You will not be able to comment anymore.
Super Smash Bros 4 - The Miiverse stage is a normal battlefield.
Mario vs Donkey Kong: Tipping stars - The community service will be removed entirely.
Splatoon - You can't post content (such as drawings, they are no longer in plaza or stages.)
Wii U Chat will also be removed, and the Waki Waki Plaza (screen with all of the mins on it) will no longer display games' posts.
Miiverse icon will still be available, but if you click it, you get an error message (Nintendo likes to be lazy.)
This is the downfall of Nintendo's 2nd and 4th greatest console. With the Nintendo switch not having a built in service, the future of nintendo's online community is at risk.
NOTE: You can download all of your posts, for info go to the Miiverse website.
I hope this helps. Because I'm heartbroken.