, later .. Win10 Creator Upd will provide a theme color picker that includes various advanced options that allow users to customize the color of the Windows taskbar and other UI elements and to preview the overall theme of Windows.
This will be a great change to the look of the Windows 10 operating system. I have been waiting to see when I can customize my Windows 10 colours and User Interface to the way I want and this news comes at the right time.
Why do I get Windows version information instead when I click on 'About Registry Editor' in this build?
Because it's a component of Windows. Most, if not all of them, do the same. It happens on Windows 8.1 too (which I'm using right now).
Most default features in Windows 10 are components of Windows operating system. I think this is just a lazy act of not taking into details the information about Windows 10 and its components.