From Ubisoft;
For the past 4 years Ubisoft has been proud to work with Cyan Worlds on the Myst brand, and we are saddened by the decision to close the doors of their games production unit. While this event is a sad day for Myst fans and gamers everywhere, it does not in any way affect the upcoming launch of Myst V: End of Ages which is already in manufacturing at this time. Ubisoft is continuing full steam ahead with the launch of Myst V: End of Ages, the Grand Finale of the Greatest Adventure Game of all time.
While the production unit has been disbanded, Cyan will continue as a company, pursuing new endeavors for the future. In the next few weeks, Cyan is expecting to provide more information about their plans. Other than this, Ubisoft has no additional information about Cyan or their future plans.