Heather Larkin has started adapting The Book of Atrus as a web comic. (This is the first of the three Myst novels, written by David Wingrove from Robin and Rand Miller's storylines.)
The comic starts with Atrus as a child, living in the desert with his grandmother. It's kind of adorable. I wasn't a huge fan of The Book of Atrus as a novel, but this presentation is simpler, more direct, and touching. (Only three chapters are posted, covering roughly the first two chapters of the book; we'll see if it stays on track.)
(Also: Russian translation!)
Cyan has already released Myst and Riven as iOS apps, but now they're working on porting RealMyst to iPad. (Currently labelled as iPad 2 and 3 only.)
Yes, it's yet another release of the same damn game, but it will include the Rime Age. Rime was added for the original RealMyst release and is not available in the current iOS Myst (nor other ports of the 2D Myst engine).
Also, the technology is more up-to-date. As I understand it, this uses the Unity engine. The 3D navigation looks pretty smooth -- it avoids the trauma of the virtual d-pad, at least. (Don't ask.) Unity is well-supported these days, so it would be an easy port to other platforms, or as a starting point for a new original game.
Well, we can hope.
A couple of preview videos: Myst Island and Channelwood. The release date is given as "Spring 2012", which at this point means "when it's done", I suppose.