Question about next Gen game releases

Hey, I was curious if anyone fully knows how the next gen games will be released. What I mean is, when Call of duty and Battlefield for example come out, will they be out for PS4 and Xbox one too on the official release date? or will we get our games the same day of the consoles launch date? i asked the dude at my Gamestop and he had not a clue. Hopefully someone has an answer, thanks :D