POKEMON GO Is Getting Story Missions and The Legendary Mew

A new update to Pokemon Go adds a storyline to the game, several quests, and the legendary Mew. 

When and how Shiny Mew should release in Pokemon Go - Dexerto

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Pokémon Go' adds new story missions, quests, Mew

8/8 Mythical Quest Mew, 0% or 100% Catch rate?

Just occurred to me what an interesting day I've had for Pokémon go, got a shiny mew, a new mythical, a shiny shadow, and a perfect hitmonlee (the purified one) : r/pokemongo

Pokémon Go and Mew: How to finish Mythical Discovery Field Research fast!

POKEMON GO Is Getting Story Missions and The Legendary Mew — GameTyrant

Pokemon Go Adding Mew Through New Quest System

Pokémon Go is introducing new story missions and daily quests - The Verge

Mew, Heroes Wiki

Hundo Mew from the A Mythical Discovery special quest : r/pokemongo

How to catch Mew and Mewtwo in Pokemon GO - Quora