The brief video provides a glimpse of the sedan's silhouette and lighting.
"If you take a closer look, you might catch a glimpse of the fantastic silhouette," the company says.
Recent spy shots provide a better look at the revamped Sportback, though the updates are difficult to spot aside from the new headlamps and taillights. The grille is also expected to be redesigned to mesh with Audi's latest sedan styling.
The new A6 will presumably benefit from a Virtual Cockpit layout and a full complement of safety and assistance technologies.
Unconfirmed reports suggest a new Sport trim will be added to the series, with blacked-out trim elements and a flat-bottom steering wheel with paddle shifters.
The new A6 is expected to be formally unveiled in the near future.