Following the release of the Windows 10 20H1 build 18970 for Fast Ring Insiders today, Microsoft is flighting today two new builds for Windows Insiders in the Release Preview ring. Because Microsoft is currently doing what it calls a " throttled delivery approach,” only a subset of Release Preview Insiders received their first 19H2 build earlier this week, and that’s why Microsoft is shipping today two separate cumulative updates for Release Preview Insiders currently on 19H2 and the rest still on the May 2019 Update (19H1).
— Windows Insider (@windowsinsider) August 29, 2019
If you belong to the 10% of Release Preview Insiders who received the 19H2 build 18363.327 earlier this week, you’ll get the 19H2 Build 18363.329 today. The rest of Insiders in the Release Preview Ring will get the 19H1 build Build 18362.329 today, though both builds actually include the two following fixes.
We fixed an issue where on devices with LTE capability, some SIM cards from certain carriers would not work correctly.
We fixed several issues resulting in bugchecks on some devices.
Microsoft will apparently continue to ship separate cumulative updates for Release Preview Insiders on 19H2 and 19H1, though these updates will include the same fixes. Here's what the Windows Insider team had to say about these servicing changes today:
To offer a clarification on these releases – 19H1 and 19H2 share the same servicing content. That means they share the same Cumulative Update package. For the small subset of Windows Insiders (the 10%) in Release Preview who were given the option to install 19H2, an enablement package is downloaded from Windows Update that turns on the 19H2 features. This *changes* the build number for the OS from 19H1 Build 18362 to 19H2 Build 18363. Because they use the same servicing content, the build revision number (the number that comes after the dot) will always match between 19H1 and 19H2. As we continue to test our servicing packages in the Release Preview ring, Insiders on 19H1 and 19H2 will get a single Cumulative Update with the same fixes.
With two different development branchs and the introduction of A/B testing in the Release Preview ring, the Windows Insider Program has become much more complex this year. We hope you won't need to be computer scientist to understand how the program works in the near future, but hopefully this all helps Microsoft to get better feedback about new features coming with the 19H2 and 20H1 updates for Windows 10.