These 20 slides share highlights of the new features that are part of the Windows 10 Preview version 

http://www.networkworld.com/article/2835036/windows/windows-10-a-guided-tour.html

QUOTE: Microsoft released a technical preview of the next version of Windows for the public to download and try for free. Although a final release with additional features isn’t expected until the middle of 2015, there are already a number of changes compared to Windows 8.1. Here are some of the most prominent features summarized in a slide show presentation