Microsoft confirms that windows 8 development is under process, But you can check its new look by Windows 8 Transformation kit. Windows 8 Transformation Pack will provides lots of new features along with a newly designed interface. Though it looks very similar to the windows, but there are many new changes like the new boot screen, explorer, taskbar, login screen, Windows 8 Aero Theme and so on.
Check out the screenshot below:
You can Download the Windows 8 Transformation pack for Windows 7 here