James, I had a 2012 S8 with led headlights but non Matrix, and because of the high beam assist it was possible to upgrade almost plug and play to the Matrix led,same wiring ect simply uses the camera in the windshield for the matrix. They are self contained units so no control modules needed the brains are in the light itself.
I've just ordered my 2017 S8 now it comes standard with matrix. Although I'm very dissatisfied that the virtual cockpit is not available after holding out. I've been told by the dealer that the D5 is not going into production until late 2018 so it's unlikely I'll have a VC until late then.
Hope that helps
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