I was thinking about the exclusive game and here are my thoughts:
1) Devil May Cry 5 - Nintendo got Bayonetta and MS got Scalebound. I can see Crapcom giving Sony DMC5 for that as a joint project.
2) Onimusha - if not DMC5, then maybe Onimusha.
3) A Rockstar game which is still owed - I can imagine Rockstar willing to play ball with Sony this gen since they have come out strong unlike last gen. Whether this is a HD San Andreas, Red Dead or Agent is another story.
4) Titanfall Complete edition - rename it, re package it and release it in March. EA is capable of douching out and doing this.
5) Ninja Gaiden 4 - co developed with Sony Japan.
6) Shenmue 3 - most requested, much loved and it would destroy the internet if announced.