Windows 8 will be able to support large screen and high resolution monitors (often through HDMI connectors), as this opens up a broad range of exciting new scenarios, according to the blog of Windows 8. They set out to achieve the following goals for those using multiple monitors with Windows 8:

* Make the desktop a more personal experience. Perhaps the most personalized feature on the desktop is the ability to customize the desktop background. We set out to make this a great experience on multiple monitors too.

More (http://www.forumswindows8.com/info/windows-8-multiple-monitors-280.html)