From the looks of it, this does not dramatically change the look and style of the game like Sikkmod does. Unfortunately, the modder did not share any additional details. This mod aims to improve the game’s graphics by introducing higher poly models, tga texture sources, soft shadows and various effects.
Modder ‘y2keeth’ has released a brand new version of his graphical mod for Doom 3: BFG, Doom 3 BFG Hi Def.