Myst III: Exile is shipping. I will try to resist the urge to purchase it on sight. I will probably fail, because I’ve seen some movies of the gameplay.
Riven was the most beautiful piece of art I’ve ever seen on a computer. I’ve played it right through twice, and will probably go back and play it a third time. Myst III basically takes a Riven-like world and makes it fully 3D, so you can rotate to any angle. When technology advances far enough to produce fully immersive 3D worlds via neural interface, the Myst series is going to produce some serious social problems.