Answering a query from a user on Microsoft Connect, someone on the IE team responded to a bug report by saying “Thanks for the feedback. We’re making substantial changes to the UI, we’ll keep this in mind. Best Regards, The Internet Explorer Team.”
For a more extensive list on upcoming features you can check out this list.
Internet Explorer 12 may bring substantial UI changes. At least, that’s what a response from the IE team is hinting at, but nothing has been shown off publicly just yet.