Open questions about transferring to the PS4 version

[Eztam]

Basically by upgrading to the ps4 version, your ps3 version becomes unusable. The cd key registered to that CD was binded to your account, by transfering to PS4, it is basically removing the PS3 cd key and turning it into a PS4 cd key. You can play the same account on both systems from what I understand, but you would need to purchase another copy. Same way as those of us that play on PC, can still play our characters on PS3 if we purchase a copy for it and register that key to our account.

[Highlanderx]

You can play on both systems.

removing the PS3 cd key and turning it into a PS4 cd key

true but instead of a CD-key, its a PSN code that redeems like a PSN purchase of the game and you can't buy the same thing twice off of PSN

But SE said to play on both you need, to not upgrade and buy a PS4 copy.

That could be because
1. the PS4 version costs more money and they are just trying to get you to pay more.
2. Because of the way PSN works and how they are doing the upgrade, buying and redeeming a 2nd PSN copy won't be possible.