I looked into an aftermarket headunit to gain Android Auto.
Turned out I would need one of these kits:
http://www.connects2.co.uk/Product/ProductItem/CTKFT13
To enable the control functions of the car offered inside the existing UConnect.
Plus I would loose the USB and I think microphone. So sounded like more hassle then it was worth.
I'd be interested in swapping the new model instead but assume the cost would be very high.