The Audi A7 (and S7) haven't yet been crash tested by either of the U.S. agencies; and in all likelihood, because they're relatively low-volume models, they likely won't be.
Even relative to more expensive luxury sedans, there's nothing missing from the A7's list of standard or available safety features, and there are actually quite a few high-tech features that could help you avoid an accident. The A7 comes with emergency braking assist and strong xenon HID headlamps, while options include adaptive cruise control, active lane assist, Audi side assist, and an Audi pre sense system that sounds a warning chime if it's anticipating a collision.
Also available on the A7 and S7 is a special night vision assistant can highlight objects, people, or animals ahead in yellow or red, and give audible warnings, based on thermal imaging technology. And for 2013, there's also a new corner-view system added to the A7's options list.