I’ve just updated my Windows 10 laptop with this pre-release build of Windows 10 via the Windows Insider Program. It’s a chance to try out new features before the normal release date of significant updates to the Windows 10 operating system (see here for more information).
When it first loaded there was initially little to distinguish it from my existing version, just the information in the bottom right-hand corner of the desktop (shown above) and a weather icon and text on the taskbar. The latter expands to show various other information (which you can customise), but I like a minimalist taskbar and so I soon got rid of it. If you like these kind of features, you might find it useful.
Geeks (like me) can find more information here.