Unreal Engine 4.19 Features are:
New: Temporal Upsampling
a new upscaling method called Temporal Upsample that performs both a temporal accumulation of the frame at lower resolution and primary spatial upscale, reducing output blur.
New: Dynamic Resolution
Unreal Engine 4.19 now has support for Dynamic Resolution, which adjusts the resolution as needed to achieve a desired framerate, for games on PlayStation 4 and Xbox One! This works by using a heuristic to set the primary screen percentage based on the previous frames GPU workload
New: Unified Unreal AR Framework
the Unified Unreal Augmented Reality Framework provides a rich, unified framework for building Augmented Reality (AR) apps for both Apple and Google handheld platforms. The framework provides a single path of development, allowing developers to build AR apps for both platforms using a single code path. The Unified Unreal AR Framework includes functions supporting Alignment, Light Estimation, Pinning, Session State, Trace Results, and Tracking.
New: Unified Unreal AR Framework Project Template
The Blueprint template HandheldAR, which provides a complete example project demonstrating the new functionality.
New: Physical Light Units
New to Unreal Engine 4.19, all light units are now defined using physically based units. Some light units were already well defined, but others were using undefined, engine specific units. The unit selection of a light is done through a drop-down menu (where applicable). For compatibility reasons, the default light units are kept compatible with previous versions of the engine. The new light unit property can be edited per light, changing how the engine interprets the "Intensity" property when doing lighting related computations.
New: Live Link Plugin Improvements
The Maya Live Link Plugin is now available and can be used to establish a connection between Maya and UE4 enabling you to preview changes made in Maya in real-time inside the UE4 Editor.
New: Sequencer Improvements
New: Landscape Rendering Optimization
The Landscape level of detail (LOD) system has been changed so that instead of being distance-based it now uses screen size to determine detail for a component, similar to how the Static Mesh LOD system works. The LOD distribution now gives more coherent sizes on distant triangles based on their screen size, which can maintain detail that was not possible before.
New: Proxy LOD System
The new Proxy LOD system is an experimental Plugin for producing low poly LOD with baked materials for multiple meshes. The new system is used by HLOD and is a replacement for Simplygon.
New: Material Layering
Material Layering enables you to combine your Materials in a stack, using the new Material Layer and Material Layer Blend assets! This enables you to build the correct Material Graph without building sections of nodes by hand. This functionality is similar to Material Functions, but supports the creation of child instances.
New: Improved Facial Animation Sharing using Curve only animations
You can share facial animations between characters by animating a curve to drive a pose without having any bone transform. Any bone transform, even with one mesh’s ref pose, won’t work for other meshes, so it is important to remove them and start with the mesh’s own ref pose if you want to share the curve between different meshes. This allows you to share the facial curves between different faces.
Added the ability to allow users to delete all bone tracks, leaving only animation curves. You can access the Remove All Bone Tracks option from the Asset menu under Animation.
More here
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