After the credits sequence rolls (that's also called the "bumper," the part before the plain black-and-white names and characters part rolls), using the same stylized hyper-colored imagery they’ve used in the posters and character art, there’s one more scene waiting for you on the other side. It’s pivotal and important, too.
There is not, however, an after-credits scene. While Marvel Studios frequently makes use of both, giving a major story beat in the mid-credits, and an extra tease or sometimes a joke post-credits, it seems DC Films/WB is not following suit. Of course, this is also based on early screenings, so it could change after the film itself is released. We’ve reached out to Warner Bros. for confirmation, and should they provide it, will update.