Microsoft has designed the Windows 8 operating system to be supported on pixel-dense (also known as Retina Display) screens. Many display maker companies are looking forward to using post HD resolutions as a selling point for their displays.
Windows 8 was designed based on the expectation that it would be running on multiple display sizes and resolutions. Therefore it was optimized for three classes of resolutions: standard, HD, and quad-XGA (2560×1440).
Buttons and text will be shown without being scaled in the standard display. In HD resolutions, the buttons and text will be 140% of normal size. Quad-XGA displays will see text and buttons increased 180%.
The problem is that familiar user interface elements such as pulldown menus and small boxes become burdensome on high density screens so Microsoft plans on replacing them with a new ecosystem of gestures.