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.

Pokémon GO' Map Changes Where Pokémon Spawn

Pokemon Go Map to get a MAJOR overhaul; Know what's changing

Mobile game Pokémon Go is changing remote raids, and we hate it

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

Niantic say they want Pokémon GO players to go back out into the world again, world says 'no

Power up PokéStops to receive better rewards and create new AR experiences – Pokémon GO

State of the Game: Pokémon Go - the phenomenon that's now a wonderful routine

Pokemon GO: Blaze New Trails Event Introduces a New Feature Called Routes Allowing Trainers To Add Custom Tracks, Here Are the Details

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

Congrats rural players: Pokemon GO community reacts to new in-game map changes