Internet Explorer 10 Preview 4 out : Windows 7 not supported
Microsoft has just released the 4th preview of the Internet Explorer 10, with feature improvements targeted at creating Rich and creative Web Apps for the Browser. There should be little energy movement for this new preview because most devs will not be able to use the browser, because it can only run on Windows 8 preview release that came during BUILD conference.
Focusing more on Metro Style UI and Apps, looks like Microsoft missed the point of the preview. Since the entire developer community develops on Windows 7, excluding them from the preview will exclude the time and the insights they could have given.