Oh, when I came into this thread, I thought it was about the most recent trailer and what it revealed in it. 

Anyways, I disagree with the OP. I don't think they are biting more than they can chew. Based on what the trailer revealed, the movie is going to be well-balanced with all of these cameos. I mean, with the way that Warner Bros. are doing their DC film-shared universe, cameos first are a lot better than what the MCU did with whole films. Like, we're still getting those solo films of people like Wonder WOman and Aquaman, but those will be later down the road in the DCEU, probably setting up JL2 and future potential team-up movies.

In either case, I'm excited for Batman v. Superman: Dawn of Justice and Suicide Squad. Both have a great cast and both will give me fanboy orgasms. <3