Like most other things, I don't think it does... The documentation only mentions "surfaces" (does mipmapping usually affect everything?) In fact, with the exception of ent_blend(), all of the great improvements made to the engine recently seem to affect only level geometry etc. In other words, you can make fantastic looking levels, but the people and creatures that inhabit will look inferior by comparison... (No prizes for guessing that I'm hoping for some improvements to the models in 3dgs... preferably before A6. )