Apple previews iOS 11.3: Update will let you turn off iPhone throttling, see all the changes here

1. New features will display battery health and recommend if the power cell needs service. These can be accessed by going to Settings -> Battery and are available for iPhone 6 and later models.
3. ARKit 1.5 will be introduced to developers. ARKit will be able to place virtual objects on walls, doors, and other vertical surfaces. Additionally, it will be able to map irregularly shaped surfaces in a more accurate manner. The view of the real world through the camera will get 50% greater resolution and support for auto-focus will be added.
5. 4 new Animoji characters will be added - a lion, bear, dragon, and skull.
6. Music videos are coming to Apple Music.
7. Apple News will get improved Top Stories and Video group feature in "For You" section
8. Business Chat feature will be added as a beta to Messages. It will allow users to communicate with businesses more easily.
9. Support for Advanced Mobile Location (AML) to automatically send a user’s current location when making a call to emergency services in countries where AML is supported.
10. HomeKit software authentication allows developers to add HomeKit support to existing accessories.
Cupertino has already made iOS 11.3 available to iOS Developer Program members and will release a public beta in the coming weeks. The company says that the update will be available "this spring".
And here's a list of all the changes mentioned in Apple's press release:
source: Apple
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