There will not be any dummy units made on the 3rd Run E7s. There is not a lot of demand at they often don't price out competitively enough to justify making them. With all the road specific detailing, the cost is already 2/3 or more of the cost of a powered unit.
I find though that the new locomotives are very power efficient. I ran 15 GGD cars and 5 powered locomotives (3 E8s and 2 FL9s) just to see what would happen and I was right around 7 amps in the straight sections and about 9 through the 072 curves.
Can't wait to see T&P pictures on layouts when this arrives. Rolland - I hope you bring yours the September meet!