Just finished the demo of Myst IV: Revelation. Holy crap. It's the rich environment of the original Myst, combined with interactivity and live 3D rendering from a high-end first-person-shooter. Wow. You start off on a platform over a lake, and the water is actually moving, with waves and ripples, toward a waterfall, where it accelerates and pours over the edge. And the moon is high over your head (and you can actually look up to see it) complete with atmospheric effects and awesome sound effects (and music by Peter Gabriel). It looks and sounds like the pre-rendered snapshot views of Myst, but it's all dynamic and live. Amazing.
The demo is still a bit rough in places, but I can see this coming in very handy for decompressing during the big APOLLO/Pachyderm haul this fall...
The demo download from the official website kept coming down busted, so I ended up grabbing it via BitTorrent overnight (couldn't do that from campus, though... damned IT filters...)
Anyway, the game should hit in September. It's already on the wish list with the family... ;-)