Charles Roven confirmed SS to be PG-13

“The intention of the film is definitely to be PG-13… We really want to make these films tonally consistent so that, as I said because this is a shared universe, at least our current thinking—and again, we’re not dealing in absolutes because while this is business it’s also a creative endeavor, so you want to leave yourself open to changing your mind, doing something different, being inspired, that’s the whole process of filmmaking is you have to allow for inspiration as well as having a road map for what you’re gonna do.
So our plan right now is to make all these films PG-13. In some cases, you know, right there on the edge of PG-13, but still PG-13.”

sauce
http://collider.com/jared-leto-joker-method-suicide-squad-rating-charles-roven