It's only March and Audi has already changed the design of their 2005 models (mainly the appearance of the grill). Headlights and taillights get a change too.
The A4 now has the larger grill that goes down into the bumper (taken from the A6). And the 1.8T is replaced with a 2.0T while the 3.0 is replaced with a 3.2
The S4 also appears to receive the same styling changes although no changes to the engine.
I didn't see this on the Audi USA main page, but rather on a local Audi dealer page.
It's a flash ad on their main page. Here is the ad pulled from the site.
Audi Models