As with previous years, the team behind Mysterium are soliciting designs for a convention logo as well as submissions of stories and other original works based on the worlds of Myst for inclusion in the convention book. (Mind you, all submissions must fit Cyan Worlds' guidelines for fan-created content.) The events are still in the early stages of planning, but they currently show live quests, puzzle challenges, and we'd bet there will be some bevin meetups for Myst Online: URU Live cavern-dwellers in the mix.
Considering CAVCON (or "cavern condition" for those unfamiliar) is currently standing at 4 (read: good) in regards to the current funding for Myst Online: URU Live, perhaps we'll see some official representatives from Cyan sign up to host a panel or two this year as well. Either way, it should be fun for all the D'ni devotees!