PS4 account?

[Feyniphia]

form what i have been reading,
if you have the ps3 version, then the ps4 version is a FREE upgrade (your ps3 game key, becomes your ps4 game key)
so
when you do upgrade to the ps4 version, to play the ps3 version you will need to REBUY it fort the ps3

Would be stupid, once you own the PS3 version, you can use it whenever you want. Once you'll get the PS4 upgrade, you can freely play on either of them.