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.

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

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

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Even Pokémon GO is impacted by the COVID-19 outbreak as Niantic Labs tweaks social AR games – GeekWire

I'm honestly getting sick of Niantic toying with my feelings. We finally think they do something right, just for them to strip it away from us. : r/ pokemongo

The Real Impact Of Pokémon Go's Changes That Niantic Won't Face