And a map-style more like SMAC's would be nice too... ie: elevation/ rockiness/ and rainfall stats for each tile.
Personally I think CIV V will have a more realistic global enviroment as a primary feautre... ie: global weather patterns (oceanic currents and whatnot) which are affected by pollution and terraforming. Tectonic plates as a paradigm for map generation, with subsequent vulcanism and earthquakes. And a water system modeled on the same princibles, meaning mountain ranges break clouds, which then determine the courses of rivers.
Couldn't agree more. I was pretty disappointed that Civ 3 didn't come out with a n Alpha Centauri-like climate system.
Another thing I'd appreciate being replicated from Alpha Centauri is bits and pieces of that game's diplomacy system. Though I like the fact that the AI shows you just what factors are affecting your relationship, I much prefer Alpha Centauri's more serious approach to foreign relations. Not only are the leader avatars less cartoony, but I also preferred SMAC's system leader attitudes of magnanimous -> solicitous -> cooperative -> noncommittal -> ambivalent -> obstinate -> quarrelsome -> belligerent -> seething.