I am not sure what version of IE you were using when you asked this question.
Just for everyone's information, I am able to view the hover style through the HTML tab by using the following sequence of steps in IE 9:
- Open the developer tool
- Hover over the element you want to view its hover CSS while leaving the developer window focused.
- Press F5 while your mouse is still over the element
- Ctrl + B and click on the element
You can now view the hover CSS.
Edit (Jan 2015):
In IE 11, you click the large blue "a:" icon that appears in the top right of the Styles pane of the DOM Explorer, and then check the "Hover" checkbox.
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