Did Sony Hold Back Major Games During PlayStation Showcase?

Rumors suggest that Sony may have opted not to include some major PS5 games during its recent PS Showcase event, leading to speculation about the possibility of a second showcase or exclusive content at the upcoming Summer Game Fest. Tom Henderson, who accurately leaked the existence of Sony's Remote Play handheld Project Q, teased that he had seen trailers for unannounced games that weren't shown at the event. However, it's unclear what these games are or if Sony has any plans for a second showcase.