Microsoft has recently created a new site http://status.modern.ie that allows you to see what features they are working on. It also allows the community to propose features and see the current status of features. The first thing I looked up of course was the GamePad API and I was pleasantly surprised to see that the status is in development. This seems like a great step forward for Microsoft in terms of opening up the lines of communication on their plans for IE features.
Develop games in your browser. Powerful, performant & highly capable.
Oh yeah, and the web audio API is also in the works...