Last week we released the Expression Encoder 2 SDK. Here's a little video of Charles and I, giving a quick introduction. Apologies for the rather close camera angle as Charles was just holding the camera with his left hand, and it didn't help that our makeup and wardrobe department was out that day.
You can get it from the following location.
Microsoft® Expression® Encoder 2 SDK
Please try it out and don't hesitate to send us your feedback.