Microsoft has released Internet Explorer 11 Developer Preview for Windows 7 and Windows Server 2008 R2

Internet Explorer 11. Fast and fluid for Windows 7.

Fast: Internet Explorer 11 harnesses the untapped power of your PC, delivering pages full of vivid graphics, smoother video, and interactive content.
Easy: Experience the web the way you want to with pinned sites, built-in Spellcheck, and seamless integration with your PC running Windows 7.
Safer: Improved features like SmartScreen Filter and Tracking Protection let you be more aware of threats to your PC and your privacy.

  Internet Explorer 11 Developer Preview for Windows 7 and Windows Server 2008 R2