[user104658]

Originally Posted by JerseyWins

Yeeeeees please at least back to PS3. I'd play the old COD games in particular soooo much if they were compatible with PS4

Sadly, the PS3 uses a custom Sony chip architecture which makes it unlikely that any suture console will be backwards compatible until they become powerful enough to do it as emulation (which will be a decade at least).

Even PS2 emulation is still not very good.