the way i beleave it is going to work is once you buy the expansion and have it registered to your account, it will automatically allow you into the areas associated with the expansion keeping the loader and the game to focus on everything, of corse this means a slightly longer patch times for everyone, but it is the simplest way,

plus this saves SE from placing it inside the PSN store, meaning they can sell it to PS4 players Ps3 players and PC players easily. and all for the same price.


however, they may plan to say you need a specific copy platform copy of the expansion which is usually downlooked on but it grants them more profits, its all down to what they want, ease of accessibility or the profits.