Hello mjzero. If you buy the Expansion Packs or Expansion Pass on the PS3 first, you will be able to play it on the PS4 for free. This only works going from PS3 to PS4 but not the other way around. You only need to buy the expansions once if you get it on PS3 first. This article has the steps on how to take advantage of the digital upgrade program: [b][url=https://www.bungie.net/en/Help/Article/12122]Where can I get info about the Destiny next-gen digital upgrade program?[/url][/b]