It used to be that Jamais Vu, a bonus mission starring Raiden, was exclusive to Xbox platforms and Déjà Vu, is an Extra Ops mission with Big Boss recreating scenes from the first game, exclusive to PlayStation platforms. With the May 1 title update both missions will appear on the other platform as they're no longer exclusive it was announced on the latest episode of Kojima Station.
It was also revealed that players have spent an accumulated 504 years playing Ground Zeroes and the 50% of players have achieved S-rank on the main mission.