Here is a list of 48 games officially announced for the PlayStation 4, PlayStation exclusives are starred (*):

1. Assassin's Creed IV: Black Flag
2. Basement Crawl
3. Battlefield 4
4. Blacklight: Retribution [Free-to-Play]
5. Call of Duty: Ghosts
6. Carmageddon: Reincarnation
7. Cyberpunk 2077
8. DC Universe Online [Free-to-Play]
9. Daylight
10. Deep Down
11. Destiny
12. Diablo III
13. Doki-Doki Universe * [Free-to-Play]
14. DriveClub *
15. Dying Light
16. EA Sports UFC
17. The Evil Within
18. FIFA 14
19. Final Fantasy (Untitled)
20. Hohokum *
21. inFAMOUS: Second Son *
22. Killzone: Shadow Fall *
23. Knack *
24. Lords of the Fallen  (Next 24 Games)
25. Madden NFL 25
26. NBA 2K14
27. NBA Live 14
28. Need for Speed Rivals
29. The Pinball Arcade
30. Planetside 2 [Free-to-Play]
31. Primal Carnage: Genesis
32. Rocketbirds 2: Evolution
33. Shadow Warrior
    
34. Silent Enemy
35. Skylanders Swap Force
36. Sniper Elite 3
37. Super Motherload
38. Super Stardust * (Untitled)
39. (Another Housemarque game in development) *
40. Thief
41. Tiny Brains
42. The Walking Dead: Season 2
43. War Thunder: Ground Forces [Free-to-Play]
44. Warframe [Free-to-Play]
45. Watch Dogs
46. The Witcher 3: Wild Hunt
47. The Witness
48. Wolfenstein: The New Order

This is a great list in my opinion, and I like seeing so many Free-to-Play titles as well. Click each link to see a video trailer for the game.