Mike O Brian, President of ArenaNet, "The news is that I’m taking over as the game director of Guild Wars 2 for a while. Colin will be leaving us. Colin is a personal friend, leaving on good terms, and I wish him all the best."
Colin said, "An opportunity came up that allows me to see my family far more, support my wife on a project she is tackling after years of her supporting me, and a chance to cut my commute down to zero from an epic commute I have today. For now I'd rather let this discussion be about the future of Gw2 and leave my own future to that!"
We're continuing to focus on Fractals as our primary focus for 5-man content. However, given the reaction, we are taking a second look at the current dungeon rewards."
Read More:
https://www.reddit.com/r/Guildwars2/comments/48zlyd/im_mike_obrien_here_with_gw2_dev_team_ama/
http://dulfy.net/2016/03/11/gw2-colin-johansons-farewell-post/#more-145061