update to Windows 8.1

quote
Over the next few months, we’ll continue to deliver innovation and
progression with an update to Windows 8.1, coming this spring. We’re
especially excited about several things I want to preview with you here.
We’ll enable our partners to build lower cost hardware for a great
Windows experience at highly competitive price points.

We are making improvements to the user interface that will naturally
bridge touch and desktop, especially for our mouse and keyboard users.
We have a number of targeted UI improvements that keep our highly
satisfying touch experience intact, but that make the UI more familiar
and more convenient for users with mouse/keyboard. Don’t worry, we still
LOVE and BELIEVE IN touch… but you’ll like how much more smooth and
convenient these changes make mouse and keyboard use!

We are enhancing support for enterprise customers via a few tweaks,
particularly including features that greatly improve IE8 compatibility
in Internet Explorer 11, which is especially critical for web-based line
of business applications. Additionally, we’re extending mobile device
management capabilities and making deployment easier.
/quote

http://blogs.windows.com/windows_phone/b/windowsphone/archive/2014/02/23/scaling-windows-phone-evolving-windows-8.aspx