One thing I like in WoW that added immersion, was the chat animations. It gave a sence of life to the character and see various expressions based in the way you typed, and the chat mode. We see these animnation from npc. I would like to see them (when I can play) from our characters. Like wjen we shout make our character look like their shouting. When we talking in our linkshells or tell make as look like we are talking into something. When in say or party make it look like we are just talking. It don't have to be silly or cartoony.
Along with this have emote trigger words. Aion did this and well. like heehee or haha laugh come up and stuff.
Again this adds life to our character instead of standing around looking like statues talking to each other.