Pokémon GO is in the process of being updated to version 0.67.1 for Android and 1.37.1 for iOS devices. This is the massive update that was recently announced, implementing major changes to Gyms, cooperative gameplay features, new items and much more. Below are some official release notes and comments from the Pokémon GO development team at Niantic:
- Gym features significantly updated to add the all-new motivation system.
- Added new Gym Badge feature.
- Added in-app and push notification system for Gyms.
- Added Raid Battles, a new cooperative gameplay experience.
- Added four new items available only by completing Raid Battles.
- Added Raids tab to Nearby screen.
- Added search functionality to Pokémon collection screen.
- Added visual indicator to unvisited PokéStops.
Source: Official Pokémon GO blog