Sony announced a number of new games at their Gamescom press conference, many of which are PS4 exclusives. You can find all the trailer for the new and previously announced games right here. Among the new games are a number of indie titles, but not many AAA titles. Check out all the new trailers here.
Rime:
http://www.youtube.com/watch?feature=player_embedded&v=rku4n1uXOrM
Shadow of the Beast (PS4 exclusive)
http://www.youtube.com/watch?feature=player_embedded&v=cWOsd-x6O9Q
Everybody’s Gone To The Rapture (PS4 exclusive)
http://www.youtube.com/watch?feature=player_embedded&v=564UaP1yeWg
inFamous: Second Son (PS4 exclusive)
http://www.youtube.com/watch?feature=player_embedded&v=0ufiyzq8QsM
Resogun (PS4 exclusive)
N++
Velocity 2X