The rings are seen in previous Cassini photos, but these new photos reveal the rings in unprecedented detail. NASA notes that these images "resolve details as small as 0.3 miles ... which is on the scale of Earth's tallest buildings."
With that level of detail, we're getting astounding images like the one above that shows a density wave rippling through the rings. It's created by gravitational interaction with Prometheus, one of Saturn's moons. (The moon wants you to know it has no idea what that movie is actually about either.) Cassini has previously given us striking images of the gravitational interactions between Saturn's moons and rings with an image of the tiny moon Daphnis causing huge waves.