Usually, Apple only previews major system releases. The point releases just happen. However, some of the features coming to iOS 11.3 seem like they would usually be part of a major release.
In addition to horizontal surfaces like tables and chairs, ARKit can now recognize and place virtual objects on vertical surfaces like walls and doors, and can more accurately map irregularly shaped surfaces like circular tables. Using advanced computer vision techniques to find and recognize the position of 2D images such as signs, posters, and artwork, ARKit can integrate these real world images into AR experiences such as filling a museum with interactive exhibits or bringing a movie poster to life. The view of the real world through the camera now has 50 percent greater resolution and supports auto-focus for an even sharper perspective.
On Business Chat:
Business Chat is a new way for users to communicate directly with businesses right within Messages. This feature will launch in Beta with the public availability of iOS 11.3 this spring, with the support of select businesses including Discover, Hilton, Lowe’s and Wells Fargo. With Business Chat, it’s easy to have a conversation with a service representative, schedule an appointment or make purchases using Apple Pay in the Messages app. Business Chat doesn’t share the user’s contact information with businesses and gives users the ability to stop chatting at any time.
On the expected battery updates:
Additionally, users can now see if the power management feature that dynamically manages maximum performance to prevent unexpected shutdowns, first introduced in iOS 10.2.1, is on and can choose to turn it off. This feature can be found in Settings -> Battery and is available for iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 6s, iPhone 6s Plus, iPhone 7 and iPhone 7 Plus.
I think this is the first time Apple have publicly acknowledged plans to allow users to enable or disable this feature. In the past, they have only said people would be able to see if their batteries were triggering performance throttling.
On Health Records, which seems big:
The new Health Records feature brings together hospitals, clinics and the existing Health app to make it easy for consumers to see their available medical data from multiple providers, whenever they choose. Patients from participating medical institutions will have information from various institutions organized into one view and receive regular notifications for their lab results, medications, conditions and more. Health Records data is encrypted and protected with a passcode.
Finally, on AML:
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.
Apple’s communication is improving in fits and starts. I hope this is the beginning of a trend where Apple are more transparent and upfront about their upcoming software updates.