Source: https://store.playstation.com/en-gb/product/EP0177-CUSA08355_00-SHENMUE12PORDER0
What could it be?
I just hope they don't screw this game up, in-game purchases are almost never a good thing.
Possibles: Shenmue passport related. Buy the capsules with real money, Multi language.
Edit:
This is strange because In the US PlayStation Store it doesn't list "In-game purchases optional" as a feature.
https://store.playstation.com/en-us/product/UP0177-CUSA12279_00-SHENMUE1AND2GAME