Pokémon GO is in the process of being updated to version 0.37.0 for Android and 1.7.0 for iOS devices. One of the big additions with the update is the inclusion of buddy Pokémon.
Trainers will now be able to choose one of their Pokémon to be their buddy. A Trainer can earn Candy for their Buddy Pokémon by walking a certain distance.
The update shoukd also make it easier to select smaller Pokémon on the screen and should fix an issue where eggs would sometimes hatch without displaying the animation.
Finally the app has been updated with support for the Pokémon GO Plus accessory.