Sony has been caught lying about one of the newest PS4 features.
According to a Gamespot interview with Sony reps in Oct, Sony representatives claimed that Share Play works across all PS4 games. When asked whether publishers can opt-out, they suggested that there was no existing option to do this. When asked to clarify on the matter further, the representatives offered an unequivocal indication that Share Play will work on all released PS4 games, providing they do not need an additional peripheral. Publishers cannot opt-out of this, GameSpot was told
The 14 PS4 Games That Block Share Play: Gamespot
UPDATE: Sony clarifies that publishers can freely disable Share Play functionality, while Activision offers its own statement.: GameSpot