I've been waiting too. I've seen no evening extra hours beyond 8/19. We loved the evening hours at AK last August. I'm really hoping for some later evenings that work with my plans. The problem of course is that at this point, I have all of my meals, dessert parties and dinner packages, and fast passes set. If WDW releases hours that do not work with my existing plans, I'll have to make tough choices. This is so frustrating.
I did note 8am (morning) EMH on 8/21, 8/26, 8/28, 9/2 (so Monday and Saturday mornings)