One thing that I have been hoping to see added, (not because it was in gw1 trolls :P) is for there to be some way to tell what abilities other players/mobs are doing.
I think this is very useful and gives you a better idea of how to counteract certain things. I know some abilities are unique to the mob but as long as there is more awareness it makes me feel like I am more in control of a fight, helps find counters and is just down right fun.
Yes, I know there are tell tale signs of what another player has access to use but still one thing is to have an idea what the person is using another is to actually plan for it and execute counters at the right time. That’s one aspect of pvp that I really enjoy. And it would be a great addition to this game.