I've made a little list of upcoming PS4 100% exclusive games (incl. PS VR). Disregarding year of release because you never know.
Playstation 4
Alienation
Assault Suit Leynos
( DELETED1 )Disgaea 5
Deep Down
Dreams
Drawn to Death
Fat Princess Adventures
Gran Turismo 7
Gravity Rush 2
Guns Up!
Hardware Rivals
Hotshots Golf
Horizon Zero Dawn
Hunger (so far PS4 only)
Inferno Climber
Kill Strain
Let It Die
Megadimension Neptunia VII
Nier
Nioh
One Upon Light
Ratchet & Clank
Ready To Run
Rime
Shadow of the Beast
The Tomorrow Children
The Last Guardian
The Witch and the Hundred Knight 2 (so far PS4 only)
Uncharted 4: A Thiefs End
Ubusuna (so far PS4 only)
Wattam
W!ld
What Remains of Edith Finch
Without Memory
(so far = Developers have specifically announced the game for PS4, however not ruling out other plattforms)
1) http://www.armagallant.com/
Playstation VR
Godling
Headmaster
Rigs: Mechanized Combat League
Summer Lesson
VizionEck
Wayward Sky
Hunting Season is done...
