Windows 11 gets a December Insider update packed with new features and AI upgrades — reveals Microsoft’s next big push. Here's everything that is new.

In December 2025, Microsoft rolled out at least four preview builds for Windows 11, rolling out a bunch of new features and changes, including Model Context Protocol (MCP), Update Orchestration Platform (UOP), Xbox Full Screen Experience for PCs, Ask Copilot, AI agents for Taskbar, Agent Launchers, and a lot more, and here's all you need to know.