Thanks for your inquiry FuzzyBruce and Wizzard . As best as I can tell the only difference between this ET-S and the original is the printing now excludes BDC on the exterior of the tank and it now comes preinstalled with the BVC coil instead of a BDC coil. If you already have the tanks I suggest just getting the coils to save a few bucks. I have tried the new tanks myself and find that they are quite similar to the original but the draw is more airy (I presume to the BVC coil) and the flavor is better.
Other than the new coil and label I don't see any changes, at least cosmetically.