Microsoft has released Windows 10 Insider Preview Build 19013 (20H1) to Insiders in the Fast ring. New DirectX 12 features include Raytracing tier 1, Mesh Shader, Sampler Feedback, and the new D3DConfig tool for managing DirectX Control Panel settings. Microsoft also updated the Windows Subsystem for Linux (WSL) 2 to now release memory back to the Windows machine automatically. Microsoft removed the Bluetooth Low Energy connection dependency from the Your Phone app in collaboration with Samsung.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-build-19013-out-with-new-directx-12-features-for-insiders/