In a blog post about new ways of screen capture in Windows 10, Microsoft has revealed a new Windows 10 20H1 Build number 18994 along with some new APIs supporting new capabilities.
Windows insiders who have opted in to skip ahead/fast rings and are running build 18994 or greater will see a new API IsCursorEnabled which supports omitting the cursor from capture. Please see all the warnings that apply to APIs in these environments.
We have added a new flag to the SetWindowDisplayAffinity function, which supports content protection by returning black in screen captures of these windows. Sometimes, applications want to simply exclude a window from capture and not return black because things like recording buttons are not always desirable in captured content. When the new flag, WDA_EXCLUDEFROMCAPTURE, is set, the window will be removed from capture entirely.
So, it is highly probable that Windows 10 Build 18994 may be heading to Fast ring insiders soon with new screen capture APIs. The latest 20H1 build is Build 18980 available for Fast Ring insiders. So, 18994 seems like a good jump in terms of build number over 18980.