Maybe birds for outdoor landscape?
And falling leaves for certain climates, certain trees are climable. And no crappy running animations for climbing ala HL/CS...possibly(this is probably going too far) mice/rodents for outdoor areas, like the alien cockroaches in HL. And swaying kelp for underwater areas.
In market-type areas, I want civs that converse w/ eachother, buy things, and drive things. I also would like to see some real civ traffic, with them going places, and for certain types of civilizations, riding creatures as well as walking to get there.
I need a new sig...