The entire purpose of the beta 4 pvp test was to give the devs data from which they could determine apprpriate attack ranges and other paramters based on the amount delay/latency/etc experienced. It was not much of an issue for me when I was trying it out in beta 4.
In other words, melee attack ranges will be a little larger to ensure you can hit an opponent who is running and most likely line of sight / angle of attack will be more forgiving than in PvE.
You will be able to unlock special skills for PvP for various things that don't arise in PvE- e.g. breaking crowd control effects, things that help close the gap with runners, etc.Have you every tried to stun a running mob? That's Reslin's point. Pair that against bards with experience kiting and they'll kite melees so they can't reach them and hop circles around casters, literally. In this combat design, with this latency, bard will be the king. A mage's only chance is sleep nuking if they can land a heavy to stop you from just running back and forth through them.