http://www.newsweek.com/pokemon-go-gen-4-sinnoh-update-changes-1160639

Niantic announced the Sinnoh Region is coming soon to Pokémon Go, along with various changes to weather, combat power(CP) and more.

According to the official Pokémon Go blog, changes to game balance will be made in two key areas. Here’s everything that Pokémon Go players will need to know when Gen 4 finally drops.