Viola was my favorite part of the trailer honestly. Margot looks damn fine as Harley Quinn, but Viola even sounds a bit like C.C.H Pounder from JLU. I don't think there was any doubt that Viola wouldn't be able to pull Waller off, but just a lot of, "Ah, there she is. There is the Wall".
I'm also really thrilled that Viola is excited about playing a comic book character. I mean, a bunch of people play them these days and they talk about being fans of the source material, but Viola just seems so genuinely excited about playing Amanda Waller judging from the interviews she's done, and it's fun to see.