Upgrading to PS4 Ghosts according to Activision Website

http://community.callofduty.com/community/call_of_duty/english/ghosts/blog/2013/09/16/call-of-duty-ghosts-seamless-next-gen-upgrade-plans#.UndZgxCIqUkhttp://community.callofduty.com/community/call_of_duty/english/ghosts/blog/2013/09/16/call-of-duty-ghosts-seamless-next-gen-upgrade-plans#.UndZgxCIqUk

The Website above explains awesome news for playstation for getting the game early.  {copied below}



PlayStation® Next Gen Upgrade Offers

Upgrade on PlayStation®4 Computer Entertainment System for Just $10

The PS4™ upgrade program is completely optional for our fans, and applies whether you buy a new PlayStation®3 computer entertainment system disc, or buy the game digitally from the PlayStation®Store for PS3™.

For a limited time, every new physical copy of Call of Duty: Ghosts for PS3 will include a flyer with a unique Sony code on it. Redeem the code packed into the PS3 version of the game on the PlayStation Store and download the PS4 version of the game for a suggested retail price of $10, €10 or £10 depending on territory.

Alternatively, if you buy the digital PS3 version of Call of Duty: Ghosts from the PlayStation Store, you will also be given the opportunity to upgrade to the PS4 version.  Simply go to the PlayStation store and purchase the discounted PS4 version for a suggested retail price of $10, €10 or £10 depending on territory. You will then be able to enjoy the PS3 version on your PS3, and the PS4 version on you PS4.

These offers must be redeemed, and upgrades purchased, no later than March 31st, 2014; offers available globally. More details about these programs will be coming soon.