This informative article and slide presentation from Information Week shares key features that will implemented for Windows 10 coming later this year

http://www.informationweek.com/software/operating-systems/windows-10-vs-windows-8-10-differences/d/d-id/1319410

Microsoft has gone back to the old days with the inclusion of the Start menu, which was missing from Windows 8. Another significant boost is that the company plans to include the personal digital assistant Cortana in the desktop version.  The other big news is the inclusion of a new browser, code-named Spartan.  Here are a few new features and improvements over Windows 8 that IT managers, administrators, and even some CIOs may find interesting in Windows 10, especially when compared to the previous version of the OS:

New features in Windows 10:
* Single platform for smartphones, tablets, and PCs
* Return of Start menus
* New browser, code-named Spartan
* Multiple desktops
* Cortana personal assistant for desktops

Improvements:
* Improved Command Prompt
* Unified app store
* Advanced menu for settings
* More options for Task View
* Revised File Explorer and icons