Like any mobile game with a required internet connection, Pokémon GO is updated week-by-week, also week. This time, if you want to have the latest version of the mass phenomenon of Pokémon trainers in augmented reality, you must update the game to version 0.137.2 on Android devices and version 1.105.2 on iOS.
As of the Niantic press release , there is not much hope of finding new content in the game. It is about “correcting errors”, although maybe the dataminers manage to anticipate new improvements that would be activated in the future. We will be parrot, of course, if that is the case.