E and E+ look brutal. An inch less width than on the -200 and 1 to 2 inches less recline. And the aisles will be narrower as well. Couple that with only 6 lavs for 300 Y passengers and while you may not have quite an AC Rouge Slaveship, you certainly have third class steerage.
Unless I am going to be in J, I think I will be booking away from this bird. The -200s and 767's (and even the 757s) all look to me a lot more comfortable.