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I play on PS3 and PS4. Your game data is actually saved on the Destiny server, so everything you've done will transfer over to the PS4, but you're still going to need to have a copy of the game to play it on the PS4 unless you bought the upgrade version when the game released. This version was offered on release day. You were offered instead of buying the physical copy for PS3 a digital version and along with it was a free upgrade to the PS4 version. So in short, your save data is ready for PS4 but you're still gonna need a copy of the game to play, whether digital or physical.