Square Enix announced some extra features for the PC version in a new video.
The PC version of Sleeping Dogs is not an identical port because it has been enhanced with a "high-resolution texture pack". The PC version of the game will support newer AMD and Nvidia cards.
Here's what publisher Square Enix said:
"The high-resolution texture pack updates the game to a new level, bringing eye-watering detail and crisp clear rendering to everything from city skyscrapers to crumbling ancient temples. Another layer of depth is added for gamers running at higher resolutions using increased small object detail to render smaller items of the world from a far greater distance to give an incredible sense of scale and detail. In-game shadows receive a significant upgrade with support for high-resolution shadow textures, high quality shadow filters and support for Screen Space Ambient Occlusion*. Sleeping Dogs features performance enhancements for both dual and quad core PC setups, enhanced performance for Nvidia SLI and AMD Crossfire, support for keyboard and mouse setup (including key mapping) and optimisations for both 3D and multi monitors on both AMD and Nvidia hardware."
Take a look at the PC features in this video.
■ Jensen6