The Internet Explorer Platform Preview has been updated for Windows 8 Developer Preview.And this is only for Windows 8 DP. This IE10 preview adds even more support for HTML5 technologies, enabling richer Web applications with significantly improved performance.
One can download it from http://ie.microsoft.com/testdrive/Info/Downloads/Default.html
This is not an update to the Platform Preview of IE 10 on Windows 7 which is still at platform preview 2 (PP2). While the one released for Windows 8 is PP4.
IE10’s hardware acceleration of technologies like SVG, CSS3 transforms and animations delivers faster rendering than other browsers. For the demo and more details of its highlights, please check the IE team’s blog post.
If you install this new IE10, you must test drive it at http://ie.microsoft.com/testdrive/