The website Modojo recently had an interview with Rand Miller about the recent release of realMyst for the iPad. The interview covered several major questions on Cyan's decision to port realMyst to the iPad as well as technical details on the challenges faced with the project. Rand even goes on to talk about Cyan's future plans to release a less-compressed version of Riven specifically for the larger screen of the iPad. In addition, he even hints that the next logical project for Cyan would be realRiven, but he says that would take years of work.
See also: Riven for iPad