People talk about a movie based on the Myst games. People have been talking about it since Myst first appeared. Cyan even starting working with the Sci-Fi Channel around 2002, but that effort was quietly canned after a few months. (For creative differences, i.e., Cyan didn't like what the SFC was planning. As the SFC's adaptations have ranged from the miserable (Earthsea, Riverworld) all the way up to adequate (Children of Dune), nobody was too stricken about this.)
It is less well known that a couple of indie filmmakers have been struggling with a Myst film for several years now. They only opened their web site this past February, but there has been a great deal of quiet work before that.
Patrick McIntire and Adrian Vanderbosch do not yet have a movie. They do not yet have funding, or actors, or indeed a complete script. They do, however, have a concept trailer. This is an animatic, a series of storyboard images linked with music and voiceover dialogue. They produced it in 2004, in support of their proposal to Cyan to make a movie. Cyan liked the looks of it, and said "Go for it."
Yesterday they put this animatic on-line. So take a look.
It may help to know that the movie is based on Myst: The Book of Ti'ana. It is set many years before the Myst games, the era of Atrus's grandparents, at the height (and end) of the D'ni civilization.