6? I see 2, like most others.
The sequence where the man in white hood is extended by focusing more on his face.
Noctis just before he fights the guards in the town square in broad daylight is another extension.
There is a scene where he is falling amidst a burning building that was shown before in the other 2 trailers.
The leviathon scene that's been posted here I counted as an extension.
Noctis gets into a situation where he is sliding on the floor and knee capping a person with his gun.
The other scene that's been posted when Noctis is facing the others in an airship is new.
So actually 5 extensions (instead of 6) and 1 new scene.