Audi of America said the pair will "receive significant engine updates for 2016 that offer more power and refinement."
The A6 gets a new 2.0-liter TFSI four-cylinder engine that generates 252 horsepower and 273 pound-feet of torque. The engine is available with front-wheel drive and a seven-speed dual-clutch S tronic transmission.
Engine offerings for the A6 will also include 2.0T, 3.0T and the TDI clean diesel.
Design changes to the A6 and A7 include new front and rear restyling. A new front fascia includes a new LED headlight design.
The cabin gets new color combinations in Flint gray or Cedar brown. A new Arras red interior is optional on the S6 and S7 and includes carbon-fiber inserts.
Consumers can also expect better connectivity on both. The optional MMI navigation plus features voice control, Audi music interface and Bluetooth integration. The Audi connect system includes an integrated Wi-Fi hotspot for up to eight devices.
Pricing and launch timing on the 2016 A6 and A7 were not announced.
Edmunds says: Two of Audi's key models take center stage at the 2014 Los Angeles Auto Show.