Crytek have had a fair streak of bad luck in recent months, especially with Ryse: Son of Rome bombing hard on Xbox One. The lackluster sales didn't help their financial troubles at all and to help give them a boost, they ported Ryse over to PC. Given that the Xbox One hardware is very similar to PC, porting it should have been relatively simple. It's also worth noting that Crytek don't do lazy ports, something that is evident with the extended graphics features available in the PC release of Ryse; such as 4K resolution support.