This is from NASA:
After almost 20 years in space, NASA’s Cassini spacecraft begins the final chapter of its remarkable story of exploration: its Grand Finale.
Between April and September 2017, Cassini will undertake a daring set of orbits that is, in many ways, like a whole new mission. Following a final close flyby of Saturn’s moon Titan, Cassini will leap over the planet’s icy rings and begin a series of 22 weekly dives between the planet and the rings.
Here are some related resources (I’ll be adding this list to A Collection Of “The Best…” Lists On Space):
Here’s NASA’s primary site for Cassini.
Saturn spacecraft begins science swan-song is from Nature.
The Grand Finale Toolkit is from NASA.
Mapping Saturn’s Moons is from The New York Times.
Here’s another amazing interactive/video from The NY Times.
Cassini Moves Inside Saturn’s Rings is a NY Times interactive.
Cassini’s Images From Inside Saturn’s Rings is also from The Times.
The ‘Sounds’ of Space as NASA’s Cassini Dives by Saturn is another piece from The Times.
Cassini Saturnian exploration is from Al Jazeera.
The Cassini spacecraft took another dive between Saturn and its rings. Here's what it saw. https://t.co/9tfbpke8dB
— The New York Times (@nytimes) May 6, 2017
The Best of Cassini—13 Years in Orbit Around Saturn is a photo gallery from The Atlantic.