What are the new Pokemon GO map changes announced by Niantic?

Niantic has just announced on the official Pokemon GO website that they will be rolling out new changes for the overworld map.

Pokemon Go Elite Raids Will Offer An Extra Challenge… If You Can Get To Them - GameSpot

Big Pokemon Go rework will change PokeStops and Gyms forever - Dexerto

Pokémon GO map is getting updates, and spawns are changing as well

THE POKÉMON GO WORLD MAP IS ABOUT TO CHANGE! Halloween Event Assets LEAKED!!

Pokémon GO' Map Changes Where Pokémon Spawn

In-game map updated: OpenStreetMap data imported, notable changes all around the globe

How long did it take to develop Pokémon GO? - Quora

Pokémon Go Campus Map & Guide

Goodbye Pokemon GO', Remote Raid participants drop over controversial changes: Report - Hindustan Times

Creator of Pokemon Go's most popular tracker hits back at Niantic over shutdown

Anyone else's house just turn into a Pokémon haven because of the map update? With the new map changes, spawns went from 0 to 100 real quick! So glad they're giving rural

Pokémon Go's maps now look a lot different - Polygon