Windows 77

This is what looks like the install menu for Windows 77, with a bluish-green setup background, and the Windows logo has 4 circles and looks like the Windows Vista logo (kind of). We know this OS Concept was made in 2025 because of the copyright date at the bottom.

This image is asking for a product key, we also know the build number, which is Build 5.

This looks to be an incomplete version of the Choose your edition screen, we don't have 

Command Prompt open during the connect to the internet screen, likely to show that

Likely the login screen, the day says February 15, which means that Windows 77 could come out on February 15, 2025.