Well, it appears that there's a preview version of Windows 10 available.

Before you decide to download and install, though.
It's vital that you read the Important section on that page, first.

I wonder what's new?!

Click HERE to visit the Microsoft page.

If you plan to install this version, then it would be best if you signed up to Windows Insider Program.
That way you'll get the latest updates/news/releases etc...

Bear in mind that this is a preview version, and likely to be buggy and may not have all the features etc.
It's probably designed for real enthusiast, tech and developers etc...