I found this from 2014. Apparently, Microsoft wanted to buy the IP alongside funding Ryse 2 but Crytek wouldn’t sell it. Don’t know if it’s true or just rumors.
Online rumors claim that a sequel to the 2013 Xbox One launch game Ryse: Son of Rome has now been cancelled, reportedly due to issues between the game’s developer Crytek and publisher Microsoft over the rights to the franchise.
The reports, which come via unnamed sources, claim that pre-production of Ryse 2 was slated to begin but Microsoft said they would only fund its development if they could buy the Ryse IP from Crytek. That is apparently something that the developer did not wish to give up. A Microsoft spokesperson has been quoted as saying the company has “nothing to announce about the future of the franchise at this time.”