https://wccftech.com/windows-11-insider-build-25115-released-not-for-arm64-pcs/

Microsoft has released Windows 11 Insider Preview Build 25115 to the Dev Channel Insiders. Build 25115 is not being offered to ARM64 PCs, but Microsoft said a new build will soon be offered to Insiders on ARM64 PCs.

With this release, the window closes for Insiders to switch to Beta Channel since now both the channels will be getting different builds, as Beta Channel will move on to receive more stable builds that are closer to what will be shipped to the public.