“Windows 11 Insider Preview Build 22621.2129 and 22631.2129 have been released, introducing new features and updates. The builds are available via the Beta Channel, with some features off by default. A bug bash event has also been announced, running from August 2nd to 7th.”

Windows 11 Insider Preview Build 22621.2129 and 22631.2129: What’s New?
The latest Windows 11 Insider Preview Build 22621.2129 and Build 22631.2129 are now available for the Beta Channel. These builds introduce new features, some of which are off by default, while others are being rolled out.
Important Note for New Insiders
If you’re a new Windows Insider joining the Beta Channel, you won’t be offered this update to prevent potential device issues. A small subset of existing Insiders may also not receive this update for the same reason. A fix for this issue is expected in a future Beta Channel update.
Update for Insiders on Build 22624
Insiders previously on Build 22624 will automatically move to Build 22631 through an enablement package. This package increases the build number for the update, making it easier to distinguish between devices with features off by default and those with new features being rolled out.
What’s New in Build 22631.2129: Windows Copilot Preview
Introduced at the Build conference in May, Windows Copilot for Windows 11 is now expanding to Windows Insiders in the Beta Channel via a controlled feature rollout.
“We’re expanding the preview to Windows Insiders in the Beta Channel via a controlled feature rollout.”
How to Use Windows Copilot
To use Copilot, you must have Windows 11 Insider Preview Build 22631.2129 or higher in the Beta Channel, and Microsoft Edge version 115.0.1901.150 or higher. To get started, click on the new button on the taskbar or press WIN + C to launch Windows Copilot.
Windows Copilot Features
Windows Copilot appears as a sidebar docked to the right of your desktop, running alongside your open app windows. In this first preview, you can ask Windows Copilot a range of questions or to perform actions such as changing to dark mode or turning on do not disturb.
“In this first preview, you can ask Windows Copilot a range of questions or to perform actions.”
This is just the start for Windows Copilot, with additional functionality expected in future previews.
From the Windows Blog