Microsoft has announced that it will release a preview of IE10 on Windows 7 in mid-November, with final availability to follow as they collect developer and customer feedback.

We built an entirely new browser with Windows 8, with more performance and developer capabilities. IE10 brings improved real-world site performance and additional standards support to Windows 7 that Web developers have been asking for. We look forward to getting your feedback on IE10 on Windows 7, and will provide another update when the preview is available, says the IE Team.
IE10 on Windows 7 will have the same standards based platform for developers to target as IE10 on Windows 8.