I have a rouge I boosted a few years back when they did the level 80 boost during Cataclysm, I leveled him to 85 and just left him alone. I would very much like to level him and somewhat gear him in anticipation of the new expansion. I am lost when it comes to sole damage-dealing classes. What are the main differentiations between the specs, and which are more preferable endgame PvE, and more importantly for me at least, PvP? Cheers!