(adsbygoogle = window.adsbygoogle || []).push({}); New controller and a short list of important changes.

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And new stick design
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Infrared LED kinect knows your controller location from this.
New dpad design
New thumbsticks and grip design
Integrated battery compartment < no news on recharges
Programmable feedback in the triggers
New overall shape so it easier to hold

MS are saying that over 40 design changes have taken place with this baby.

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Polygon has posted a small write up on the new controller saying it feels like S version of the current one.
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That's why I said you don't "pay extra" for it. I knew you needed a gold membership, but that's the way basically everything on XBL works.