The iOS 12.3.2/iOS 12.3.1 updates don't come with any new features, but if you skipped previous versions, you'll get some smaller changes with your upgrade.
If you skipped iOS 12.3, you'll get some smaller changes that might be of some use to you. They include:
- The ability to follow a magazine from the Apple News+ catalog browsing view
- Apple Music’s For You tab now updates multiple times a day suggesting music based on themes like genres, artists, and moods you love
If you skipped iOS 12.2, you'll get some additional changes with your iOS 12.3.2/iOS 12.3.1 update. These include:
- Support for Air Quality Index in Maps for US, UK, and India
- Information in Settings on how much time remains on your device’s warranty period
- Support for real-time text (RTT) for phone calls made through a nearby iPhone on iPad and iPod Touch
- Devices now display a “5G E” icon for iPhone 8 and later, iPad Pro 12.9-inch (3rd generation) or iPad Pro 11-inch indicating that users are in an area where AT&T’s 5G Evolution network is available
- Improvements to quality of audio recordings in Messages
Apple's improved the quality of the audio messages sent in the Messages app in iOS 12.2. The company switched to a new Opus codec at 24000 Hz.
With iOS 12.2/iOS 12.3/iOS 12.3.1/iOS 12.3.2 on board, .CAF files will also sound a lot better.