An updated platform preview of IE10 for the Windows Developer Preview is now available for download. This IE10 preview adds even more support for HTML5 technologies, enabling richer Web applications with significantly improved performance.
Windows 8 (dev preview) is required to test this release. In the comments I’ve read that “We will release an IE10 Beta and Release Candidate on Windows 7 prior to IE10’s general availability.”
HTML5 for Applications: The Fourth IE10 Platform Preview →
Download IE10 Developer Preview →