Windows 11 21380 has been leaked!

According to a comment by the OP:

So the difference is:

Internet Explorer in this build is still alive.

There are some tiny differences on system taskbar icons(such as Search, Start menu) The task view in this build is like Win10+Win11

Dark mode has outlines

There's a code on the background

Unlike current Win11, TPM and Secure boot and etc requirements are not needed