There are theories out there in other threads. Some hope this delay indicates a bigger battery and higher range are coming, but my dealer says no. I have a different theory. I ordered a 2018 in July to arrive in Oct. Now, I am being told that because of "factory construction" build will be delayed to late January with delivery in March. I believe Audi is holding back to see what the current US govt does about tax "reform." The govt needs to fund some big tax cuts that they promised the rich donors and what better place to cut than silly credits to reduce emissions based on a Chinese hoax called global warming. If those cuts are made, the etron will get an effective $4K price hike. With that, an already low seller will not be worth producing and it will be withdrawn from the US market. The 2018's haven't been tested by the EPA because Audi hasn't made and delivered them any, waiting to see how the tax credit comes out. IMHO.