Well there are a couple things that I think the devs were planning to add eventually now that they\'ve been added to Crystal Space (the game engine they are using) that will improve the graphics quite a bit. For one, real time shadows, even on a limited basis (just characters casting shadows on the environment) would be nice, and possible at least from an engine standpoint. Also they haven\'t started using shaders in planeshift. Shaders do things like per pixel lighting and bump mapping and reflection mapping and a bunch of other cool effects.
Personally I would like to see more done with lighting, especially dynamic lighting. Perhaps make the sewers darker, so you might have to carry a torch with you to find your way around, or npc\'s that carry light sources and actually walk around. That would be cool.