The Carlton Bale post said that the E-Brake hardware would now be in the Auto, but the software would not be available until after Jan 1.
I once bought a jeep in late June or early July, just before the new models came out. When I traded it three years later I got hit for a couple grand in trade in because it was 4 model years old even though it was just one month older than the 3 model year old jeeps. I think you would need a couple of grand difference, even if all other thinks are equal.