When I clicked on "Download Content", it said that I unlocked Just Cause 2, you gain access to it in the warehouse
Square Enix has announced a bonus outfit for Sleeping Dogs players who played Just Cause 2. Upon starting Sleeping Dogs, players with a Just Cause 2 game save on their console or PC will find an exclusive Just Cause 2 clothes set available in their in-game safe house.
The clothes are based on Rico Rodriguez’s outfit and will offer a bonus to players’ action hijack ability, allowing them to perform “stunt-style takeovers” of enemy vehicles from further away. The outfit will be available as soon as the game launches on August 14th.
And also.. I'm about 10 minutes in and.... This game is fucking AWESOME!!! Favourite game this year by far!