It all comes down to minimizing stealth hindrance. In 3.0, I expect that will still probably stay the same. The best defense will always be not being seen.
Currently, I go minimalist for armor on PVP. Tanned leather coat only, with no head gear, hand gear or leg gear, and as low a hindrance small shield as I can find that still caps armworn protection. The shield goes if I'm on the attack and using a bow. The coat is basically to keep the chest shots from critting. MAF would help that as well. The goal is to survive the one big hit and get out or finish the fight really fast.
I may change to using armor on all areas in 3.0, but the goal is still going to be the same. Minimize hindrance with survival primes while preventing the one shot.