neowin[.]net/news/windows-11-25h2-and-24h2-get-the-new-start-menu-and-a-lot-of-new-features-in-kb5067036/
bleepingcomputer[.]com/news/microsoft/windows-11-kb5067036-update-rolls-out-administrator-protection-feature/
In addition to the new Start Menu there's quite a long list of both new stuff & fixes for 24H2 and 25H2. Several features, like the new Start Menu, will roll out gradually, so you probably won't see them immediately after installing the update. However, if you're impatient you can use ViveTool to turn them on as explained here:
neowin[.]net/guides/windows-11-finally-has-a-new-and-much-improved-start-menu-here-is-how-to-enable-it/
And the update also adds a rather odd bug... if you have Task Mgr open and close it by clicking the X in the upper right corner, the window will close but Task Mgr will continue running. Depending on how many times you open and close Task Mgr, you could have dozens of copies running simultaneously. Right click the Task Mgr icon on the TaskBar and click End Task instead. If you don't see "End Task", go to Settings -> System -> Advanced and turn on End Task under Taskbar.
neowin[.]net/news/odd-windows-11-bug-duplicates-task-manager-process-instead-of-closing-it/
neowin[.]net/news/odd-windows-11-bug-duplicates-task-manager-process-instead-of-closing-it/