Pokémon GO is in the process of being updated to version 0.87.5 for Android and 1.57.5 for iOS devices. Official details from the Pokémon GO development team are as follows:
- Added the all-new AR+ encounter mode for Trainers on ARKit-enabled devices (iPhone 6s or later) running iOS11.
- Improved Pokémon GO Plus responsiveness on devices running iOS 11.
- Various bug fixes and performance updates.
https://twitter.com/PokemonGoApp/status/943915279301726208
Source: Official Pokémon GO blog
Pokémon Blog 
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