How to upgrade Battlefield 4 from PS3 to PS4
Sony Europe has posted an explanation on how those who purchase Battlefield 3 on PlayStation 3 can upgrade for $10 to the PS4 version. It's important to note that Sony Europe posted this, but it can be assume that the process will be fairly similar for those of us in America. So here's how the upgrade system will work:
According to PlayStation community manager 'Envisager', "Inside marked physical copies of Battlefield 4 for PlayStation 3 there will be a voucher with a unique code printed on it. This code will allow you the one-time offer of buying a digital version of Battlefield 4 via the PlayStation Store for only £10."
Alternatively, for those specifically in the UK, you can buy a PS3 copy from GAME and when you're ready to upgrade simply return back to your local GAME store and trade it back in. You'll receive £40 towards an upgrade for a PlayStation 4 version.