Well, Ryan Warzecha ("Producer, Project Manager, and Social Media Manager" for Cyan) did tweet this in reply to a tweet by Legendary asking "What movie, tv show or comic are you most excited for in 2015?". This year does seem quite soon though, considering that we only first heard about it a few months ago.
I'm actually a bit more excited for the tie-in games. Just think, some developer somewhere could be making a new Myst game right now and we wouldn't know.
Also, looking through my "Myst Fandom" thread, the reason the community has been so small as of late is because we haven't had a proper game in a decade, unless you count the short lived GameTap year. I swear the moment that there are new Myst products, old fans will come back and new fans will be made.