There have been lots of unofficial reports about when Windows 11 will be out for public. We also reported about Windows 11 marketing name and its probable release timeline via Intel driver update release notes. Windows 11 update release will be known as Windows 11 October 2021 update or Windows 10 version 21H2 and is targeted at a October 2021 release.

Now, Microsoft has sort of confirmed that Windows 11 will be ready to ship after September 24, 2021 confirming the October release date for general public. In a blog post about hardware driver submissions for Windows 11, version 21H2 (the first release version of Windows 11) Microsoft confirms that September 24, 2021 is the final cut-off approval date for compatible drivers.

Windows 11, version 21H2 based systems may ship with drivers that have achieved compatibility with Windows 10, version 2004 until September 24, 2021.
Partners looking to achieve compatibility for systems shipping with Windows 11, version 21H2 Release may factory-install drivers for components that achieved compatibility with Windows 10, version 2004 until September 24, 2021.

So, PC manufacturers pre-installing Windows 11 on their products should factory install drivers compatible with Windows 10 version 2004 until September 24, 2021. So, if manufacturers can pre-install the OS starting this cut-off date, a public release in October looks imminent.

Windows 11 brings lots of UI/UX changes and new features over Windows 10. You can read all the new features and changes that Windows 11 brings over Windows 10 in our massive collated changelog.