Microsoft today released its first preview build of Windows 10 vNext, or what will likely end up being 20H2. Of course, there are a bunch of fixes, improvements, and known issues to be aware of.
Build 19536 RSS
Microsoft today released Windows 10 Insider Preview build 19536 to the Fast ring. It's the first preview build that's from the next version of Windows, likely shipping next fall as 20H2.