Here’s the info on Sony on how the program works. Basically if you have download it’s all take care of. Got a boxed copy? keep the disc!
“For a limited time, when gamers buy the disc or digital version of selected games for PlayStation 3 they can download a PlayStation 4 digital copy of the same game from PlayStation Store for a discounted price. Redeem the code packed into the PS3 version of the game on PlayStation Store and download the PS4 version of the game. Then use the original PS3 disc in your PS4 system to activate and start playing. You do not need a PS4 to redeem your code – simply redeem your code, then download your digital copy when your PS4 system arrives.”
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