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.
Cassini will do 20 orbits past the outer rim of the main ring group. Those orbits began back in November and will extend through April. After that, the spacecraft begins its final, exciting phase. During that period it will do 22 orbits between the planet and the inner edge of the rings. That first orbit is expected to occur on April 26.