Fear not, Android fans, General Motors has you covered finally. As promised, Chevrolet, Cadillac, GMC and Buick have all announced the Android Auto update is now ready to go for vehicles equipped with the eight-inch MyLink/IntelliLink/CUE systems.
The update may only be performed by your local Chevy, Cadillac, Buick or GMC dealer at no cost to the owner, but the software must updated to Android Lollipop (5.0) or later.
Source
GM Authority