Apple has released the first beta of iOS & iPadOS 13.3 to the developers. Registered developers can download it through the Apple Developer Center.

iOS & iPadOS 13.3 Beta Release Notes

Update your apps to use new features, and test your apps against API changes.

Overview

The iOS & iPadOS 13.3 SDK provides support for developing apps for iPhone, iPad, and iPod touch devices running iOS & iPadOS 13.3. The SDK comes bundled with Xcode 11.2 available from the Mac App Store. For information on the compatibility requirements for Xcode 11.2, see Xcode 11.2 Release Notes.

Networking

New Features
Certain top-level domains (TLDs) such as .dev and .app are now in the Foundation URLSession and NSURLConnection HTTP Strict Transport Security (HSTS) preload list. An app which uses URLSession to visit a matching URL will always navigate to the URL as https://, and never as cleartext http://. See the HTTP Strict Transport Security (HSTS) Specification for more information about HSTS. (56247242)

iOS & iPadOS 13.3 Beta Release Notes