Microsoft vows to make “behind-the-scenes platform changes” as it begins testing next phase of Windows 11

Microsoft has announced it’s making significant improvements to the core of Windows 11, planned for release later this year. They’ve started testing these changes with early users in the Insider Dev Channel, using builds that are ahead of the current public version of Windows. This testing phase will focus on these fundamental, behind-the-scenes updates.

As a researcher working with these builds, I’m excited to share that the Dev Channel is now receiving builds from the 26300 series. These builds include many of the same features and improvements you’ll see in the 26220 series currently rolling out to the Beta Channel. However, we’re also implementing some important platform updates with each new build. Because of these underlying changes, you might encounter different known issues compared to what’s reported in the Beta Channel.

Germanium is the current version of Windows 11, and it’s the foundation for builds in the 26300 series. Microsoft hasn’t detailed the specific changes in this release, but with recent Windows updates being problematic, we hope they’re focusing on improving the overall stability and delivery process.

I’ve noticed Microsoft has a pattern with its Windows releases. They often start testing new builds – like they did last year with the 26200 series – promising underlying changes. Those changes eventually became the 25H2 release. If things go as they have before, the builds currently numbered 26300 will likely become the 26H2 release this fall.

Microsoft intends to release version 26H1 of Windows this spring, but it will only work on new Arm-based devices that haven’t been released yet. This version is built on a newer core of the operating system, internally called ‘Bromine.’ Because Bromine is newer than the current core, ‘Germanium,’ the next major Windows 11 update (26H2) coming this fall will actually be based on an older platform version.

It’s a complicated situation, and it will be interesting to see how Microsoft manages its future Windows releases. Currently, build 26300 is being tested and is expected to launch as version 26H2 this fall for current Windows 11 users, including some internal platform improvements that haven’t been detailed yet.

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2026-01-28 02:09