UPDATE
Warner Bros. Interactive has confirmed that the game, which will be titled "Harry Potter: Wizards Unite," is officially in development under Portkey Games in cooperation with Niantic. In the company's press release, they revealed that players will explore their neighborhoods and beyond to "go on adventures, learn and cast spells, discover mysterious artifacts, and encounter legendary beasts and iconic characters."
Interested fans can sign up at the game's official website for further updates, which should come in 2018.
The original version of this post is below.