Keep it simple and realistic.
1) /say
2) Chat bubbles
3) Gear preview
4) team chat in WvW needs work, and you can see other teams talking in local. There needs gone some kind of communication expansion in WvW period. Some quick join groups in progress option or something.
5) better chat window options. The fact you can't change chat colors that I found is annoying.
6) a little wider of range on being able to see DEs on the map.