Graphical enhancements are significant
United Front, developer of Sleeping Dogs (originally known as True Crime 2 before Activision canceled the project and Square Enix picked it up), has confirmed that they will be turning up the graphical volume, so to speak, with the PC release of Sleeping Dogs.
The enhancements for the PC known as the high-resolution texture pack brings much more detail and significant rendering improvements that bring out the detail of the game environments. If you are able to run at higher resolutions you can add an additional level of detail to increase the rendering detail of smaller items, which makes for a much greater sense of scale and detail.
Interestingly enough, it would seem that all of these enhancements are not targeted at one card manufacturer. While you need DirectX 11 to take advantage of those features, it starts with support for DirectX 10. The number of enhancements and graphics options supported is impressive. Sleeping Dogs is set for release on August 14th in North America and August 17th in Europe and it will be released for Xbox 360, PlayStation 3, and PC all at the same time.