From what I can tell there is no purchasable version the game on the PSN store via the PS4 right now. This brings up a couple questions for me as I have a PC account but I want to be able to play on my PS4. I have the hard copy on my PC and don't want one for the PS4 i just want the digital download. So here are my questions:

1. Is there a digital Download pre-order for ps4 somewhere? Or am I going to have to wait till Monday likely?
2. I know there is a PS3 copy of the game I could buy for much less then the PS4 version. What say I bought the PS3 version, could I technically upgrade it to PS4 even though i dont have a PS3?