FFIV Realm Reborn Question.

So I want to get Realm Reborn for Ps4.... however I noticed they have a thing going where you can Upgrade from PS3 version to PS4 version till december of this year... and I was wondering If I could go Out get the ps3 version and then upgrade O.O, is that  allowed?

Yes, you can buy the PS3 version now, set up your account, and then pay the $10 to upgrade to a PS4 license.

After you convert your PS3 license to a PS4 license, you won't be able to play it on PS3 anymore. And you do need to have an actual PS3 for this; from what I've read, you need to actually install and set up your account on PS3 in order to do the upgrade process.