Audi is testing a face-lifted version of its A6, due to launch later in 2015. Wheels24 spy photographers captured images of the new A6 in sedan and Avant guise.According to Audi SA, the cars will arrive "in the first quarter of 2015". Spy images show the new A6 will sport minor exterior changes. Gallery: 2014 Audi A6 Sedan (Spy)Gallery: 2014 Audi A6 Avant (Spy)The new A6 will be powered by two or three-litre V6 engines which will debut later in 2014 with sales to start in 2015. Exterior modifications will be limited but we expect more features and technology to be added along with an updated cabin.