Microsoft released the first Windows 10 SDK Preview build for the 20H1 development cycle last week, and it was the first build in a while to actually bring some new changes. Now, the company is releasing yet another one, and that's build 18894.
As you'd probably expect, there aren't many big changes in this release, and most of the changelog lists the exact same changes as build 18890. There are some new API additions, though, which weren't present in the previous build.
As with every SDK Preview build, you can use this one in a production environment alongside a stable version of the Windows 10 SDK, and you can continue submitting apps to the Store as long as they're targetting Windows 10 version 1903 or prior. You will need to be running Windows 10 Insider Preview builds, though, as well as using Visual Studio 2017 or newer.
If you'd like to download the latest the Windows 10 SDK Preview build 18894, you can do so here. As usual, the release comes with equivalent versions of the Hardware Lab Kit (HLK), Assessment and Deployment Kit (ADK), and Windows Driver Kit (WDK).