Wombat- what's your concern with IE7? I believe it's a much needed upgrade in security and functionality. Also I haven't seen any issues that would outweigh the security gains.

It's going to be an automatic high priority update, unless you don't accept updates.
Here's some more info about IE7 and how to install or block it from being installed automatically.
IEBlog : IE7 to be distributed via Automatic Updates!