Why we havent heard about the PS4 version as of yet. I think its likley that SE has cancelled the PS4 version altogether,because of the poor sales on Xbox One and PC, and i am not the only one thinking this way articles down below.
http://www.chattsportsnet.com/tech/rise-tomb-raider-ps4-release-square-enix-still-undecided/2978/
update, Square Enix reconfirms the PS4 version
http://forums.eu.square-enix.com/showthread.php?t=152129&page=2