Here are some of the features available in 2019.2 beta:
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Mobile performance and tooling improvements
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OpenGL multithreading support (iOS)
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OpenGL support for SRP batcher (iOS and Android)
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Display cutout bounding box support (Android) via the new Screen.cutouts property
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Screen brightness controls via the new Screen.brightness property (iOS and Android)
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Support for the Intel Open Image Denoise library
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Probe-Lit GI Contributors
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GPU Lightmapper improvements
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Multiple Importance Sampling support for environment lighting.
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Support for NVIDIA Optix denoising.
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Increased sampling performance when using view prioritization or small/low occupancy lightmaps.
2019.2 beta Release Notes, Manual, and Script Reference.
For discussions and queries, please open separate threads per topic.