All major textures in the game were increased to 400%+ of their original pixels, sharpened, and had some detail added. Then new normal maps were generated to take advantage of the greater detail, which results in a significant improvement over the original graphics. This enjoys 0% compression files, which helps offset the fact that larger files requires more system resources.
This only patches HiRes. It fixes everything in Patch 1 (eyes done properly this time), as well as possible hud icons, loading menus (my 4As were removed as were the nukes), and character skin (no makeup).