Several little bugs and other issues have been fixed, with some others on the chopping block. Diablo 3 v2 Hotfixes:
The super fast leveling issue has been a hot topic, since one powerful char could clear the early parts of Act One on Torment or higher, and the level 1 chars following along in the game would level up like pinball machines. Lvl 45 or higher in under an hour was regularly reported.
The hotfixes also mention the Cursed Chest near the waypoint in the Halls of Agony 3; players were surfing to find it and scoring 1/3 or 1/2 a Paragon level just from clearing that horde of flaming zombies.
It’s not listed yet, but exp rewards for low level quests might be next in line for the nerf stick. Players are quest farming easy monsters, like Mira Eamon, and racking up hundreds of millions of exp per hour with very little risk.
Also not listed yet, but a fix to the *ding* sound effect of clan notifications is on the way.