What's New in Windows 8.1

We built Windows 8 to bring a modern computing experience to businesses and to help professionals stay connected to their colleagues and clients from anywhere, anytime. Windows 8.1 advances this vision and introduces new manageability, mobility, security, user experience and networking capabilities–with the goal of offering customers the best business tablets and versatile modern business PCs driven by the most powerful operating system designed for today’s modern businesses.

http://technet.microsoft.com/en-us/windows/dn140266.aspx