Story Link
Pottermore announcement: https://www.pottermore.com/news/new-augmented-reality-mobile-game-harry-potter-wizards-unite-announced
Niantic announcment: https://nianticlabs.com/blog/wizardsunite
BBC news story: http://www.bbc.co.uk/news/technology-41929307
Tech Crunch story: https://techcrunch.com/2017/11/08/niantics-follow-up-to-pokemon-go-will-be-a-harry-potter-ar-game-launching-in-2018/