Subsystems are auto instanced classes with managed lifetimes. The Windows 10 Anniversary Update adds support for much longer filenames, on the condition that the user and each application opt-in to it. Historically, paths in windows have been limited to 260 characters, which can cause problems for projects with complex naming conventions and deep hierarchies of assets.
Support for long filenames (Experimental). We’ve made a large number of optimizations to UnrealBuildTool and UnrealHeaderTool to improve C++ iteration times. By default, UE4 will still use the Visual Studio 2017 compiler if you have it installed. Support for Visual Studio 2019 has been added. Improvements have been made to the MIDI Device Plugin allowing users to not only process MIDI Device Input, but also send MIDI Messages Out to Devices. We have improved sound asset importing, in addition to supporting multi-channel wav files, Unreal Engine now converts from a variety of sound file formats upon import including AIFF, FLAC, and OGG/Vorbis. Improvements to Sound Asset Importing. In addition to the Envelope Follower, designers can now analyze a Submix’s Spectral Energy during gameplay to drive Blueprint automation. Spectral Analyzer for Submixed Added to Real Time Analysis Tools. The Sound Concurrency System now observes multiple settings/groups.\ TimeSynth is a new audio clip based synth component focused on providing designers with sample-accurate start, stop, and concatenation sound playback. 
New Unreal Audio Engine now on by Default for New Projects. Per Platform Properties have been extended to be allow for setting values based on Target Platform in addition to the Platform Groups. Will allow the user to hide Environment Cubemap without disabling lighting The system is used for reducing the overall amount of animation work required for a crowd of actors. Added a new plugin which implements an Animation Sharing system. Animation Budgeting System (Early Access). 
Below is merely a snapshot of what to expect and you can see the full breakdown of all 115 fixes in the official Unreal Engine forums: There's a lot new in the 4.22 build of Unreal Engine 4 and the preview builds haven't been previously tested, so developers are warned not to convert projects for active development on preview builds.
The early release is an attempt to have the community catch any lingering issues before the final release goes live. Game developers gather around! The preview of Unreal Engine 4's upcoming update, version 4.22, is now available via the Launcher and on GitHub.
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