I wonder if that change was only made for the EE of AUJ and not the theatrical bd/dvd. I honestly don't care what changes they make for the extended cuts, they did that with the LotR movies where you see Minas Tirith in the background of The Two Towers. But the theatrical release should be an exact preservation of the theatrical version.
I wonder if anyone's compared an in-theater cam rip of AUJ to the theatrical blu-ray to see if Smaug looks different.