With Windows 8, the whole experience of Windows has been reimagined. It's designed to work on a wide range of devices , from touch-enabled tablets, to laptops, to desktops and all-in-ones. We've designed Windows 8 to give you instant access to your apps, your files, and the information you care about most so you can spend less time navigating and more time doing what you actually want to do. You can move between Windows 8 PCs easily and access your files and settings from virtually anywhere. We've made touch a first-class experience and navigating with a mouse and keyboard fast and fluid. And just like Windows 7, reliability and security features are built in. It's the best of Windows 7, made even better.
You can find more information on what's new in Windows 8 here. If you just want to try it, you can use the download link below to grab the iso.