This post goes to show that there is indeed still some hope left for Hunter's and that we still have a decent shot at being able to compete in Arena's come WotLK.
I found myself today on the PTR dueling my Rogue friend. I found out that I am able to compete. Disengage is extremely fun to use, although I hope they remove the restrictions on it. I also love my Tenacity pet for PvP. Roar of Sacrifice is huge, especially since it's currently bugged to absorb 100% damage, but even at 30% damage, that should be very useful in PvP with its short cooldown.
I can see myself on the PTR having better defense against melee, but no increased defense verse casters. So I truly hope they make Deterrence have that 60% spell resist again... Or casters are going to eat us for breakfast.