Windows 8.1 Preview released
Windows 8.1 Preview is now available for download and testing.
Boot to desktop option.
Start button and it opens the start screen.
Single unified search engine.
improved multiple monitor support.
improved start screen personalization.
Direct X 11.2.
It will be a Free update to Windows 8.
You can’t upgrade from windows 8.1 preview to the final windows 8.1.