I would love to see a party chat implemented..... Both for PvP and PvE. Many times I am training people on strategies for certain maps, and being able to talk while fighting would be so much easier than dying because I can't type fast enough.

I think if voice chat is limited to just your party it would eliminate most abuse, since you can just kick or leave the party.

Obviously, this would need to be low bitrate so additional lag isn't introduced, but if implemented correctly, this could open up a brand new aspect to the social side of MMO!