kb5089570 preview

KB5089570 is a preview cumulative update for Windows 11 version 26H1, released on May 26, 2026. It moves supported systems to OS Build 28000.2179 and includes non-security fixes, staged feature rollouts, servicing-stack changes, and Copilot+ PC AI component updates. The update delivers File Explorer polish, gaming hooks, audio sharing, and reliability fixes. It also reflects a shift in Windows 11's servicing model, simultaneously shipping consumer-facing features, preparing security infrastructure, and updating AI plumbing for specific hardware. This makes KB5089570 more than a routine preview, as it integrates multiple update streams into one package.