Windows 9 Will Offer Desktop Or Start Screen
 

According to this article Windows 9 will offer you the desktop or the modern UI, not both. There is no middle ground between devices that have the Modern UI and devices that have the desktop. You either have the desktop or you have the Modern UI, you cannot have both. As reported around a month ago, the Start Menu for desktop users in Windows Threshold can 'act' like a full screen Start Menu however, meaning if you want that functionality you can have it on the desktop.

http://www.hardocp.com/news/2014/08/..._start_screen/