Microsoft has been working on Internet Explorer 7 for quite a while now and has also released a few test versions to let people try out. after a few problems it looks like Microsoft is getting ready to move everyone to Internet Explorer 7 using the Automatic Updates that you usually recieve patches through.
This new pushing of a big application is really new and also is a bit of a departure of Microsoft as in the past they have trumpeted all of the new features and put up a download link, I know this is how I got IE4, IE5, and IE6. Now we will really we how popular the automatic updates are as everyone could get this update to Internet Explorer in less than a week.
Microsoft has put up more info on the Internet Explorer 7 upgrade push on their site. And the release will probably happen sometime in the next couple of months.