Beta version of Windows 11 leaks to the webScreenshots and a Build 21996.1 beta of Windows 11 were posted on Chinese social media. We don't know how recent this build is, and how close to final it is, but overall, it doesn't seem like Windows 11 is a massive overhaul of the Windows user interface.
Microsoft recycled some elements from the dumped Windows 10X and took some inspiration from Apple's macOS. Windows 11 looks like a new skin for Windows 10, with some new icons, a new logo, a redesigned Start menu, rounded corners, and a task bar that's centered by default.
XDA Developers installed the leaked build via a virtual machine and offers a bunch of screenshots over here.
You also may have spotted a new Windows logo, which is a blue Microsoft logo. It’s replacing the trapezoidal logo that we had before and flattening it out into a square. This is likely a big part of the Redmond firm’s move to make things more Microsoft-branded instead of Windows-branded. We’ve seen various references to Microsoft Server in Windows Server.