Firmament, the new game from Myst developer Cyan, will be out on May 18, and it will probably not surprise you to hear that, going by the new trailer, it will be a lot like Myst.
It sounds like Myst, too. Firmament is a "puzzle-adventure game" that takes place in three unique and seemingly abandoned worlds, each one filled with bizarre, incredible machines that serve no apparent purpose. Your reason for being there is unknown, but figuring out how the world works will ultimately uncover your role in it.