Whereas the Microsoft KB article on the availability of IE10 originally stated:
Note: Internet Explorer 10 is included in Windows 8. It is not available for Windows 7 or earlier versionsThe latest revision of the article (revised on August 21, 2012) contains the following wording:
Note Internet Explorer 10 is included in Windows 8. It is not yet available for Windows 7.We now know it is coming, but the launch date is still unknown.