Not much - you've got fractals (which I don't care for), and small changes here and there - particularly to skills. Living story => temporary content.
I mostly just do hotjoin pvp now anyway - takes 2 mins to leap straight into the action. Conquest mode is a little repetitive, but I like the small scale maps and combat.
Pve combat is boring as **** - really mindless; just dish out dps until the red bar goes down... Was a monotonous chore to complete all the zones. I still love the pve lore, races and dialogue, but just cannot play there. And wvw is too much running around most of the time.
Edit: I should say I still love the pve art and design - the environments are absolutely beautiful (well... everything west of Hoelbrak!). Shame the enemy ai is so boring. I guess that's just how it is in an mmo.