Looks like Windows Monterey, with the "Start menu" now being a Spotlight clone! I am unsure if the removal of the titlebar is a good thing - there is still an

Looks like Windows Monterey, with the "Start menu" now being a Spotlight clone! I am unsure if the removal of the titlebar is a good thing - there is still an alt-space menu to the left of windows that do not have an icon top left, and double-clicking on a titlebar is a convenient place to double-click; this isn't possible with no titlebar (eg. in Chrome/Firefox at the moment). Looks a nice modern UI refresh though.