Not sure how you expect me to find one blue post that I read randomly sometime in the past year or so. It just talked about how the RMAH would benefit the game and how they probably couldn't manage weekly quest additions, but perhaps monthly or bi~monthly.
They probably won't be some kind of giant addition. That is what expansions are for. These will likely be more like additional random event areas that appear or special quests during holidays, etc. You might find 'the default option' to be PvP, however, a good number of us actually enjoy playing the game to fight monsters as well as PvP and inferno should give us a lot of fun in that regard.
Edited by ecutruin, 23 April 2012 - 10:30 PM.