Here is the changelog for the Pok?mon GO 1.9.0 update straight from the App Updates screen:
- Capture location: The location where a Pok?mon was caught will now be displayed on their information screen.
- Pok?mon GO Plus and Incense: Trainers can attempt to capture Pok?mon they encounter from using Incense with the Pok?mon GO Plus accessory.
- Fixed a bug that caused some users to get stuck on the loading screen, even after restarting the app.
- Fixed a bug where the camera sometimes moved at slow speeds during battle.
- Minor bug fixes.