At the moment, you will need to buy the physical copy. Once the game is available on PSN, you will receive an e-mail telling you to redeem your code off of the pre-order website. To do that, you will need to put in the code you receive from buying the physical copy on the pre-order website and when it's available to you, you'll receive an e-mail.

Sony and SE have a lot more to set up than SE does with the Windows version, but it should be available soon.