Surprise patch today, 11 Mar 2015
 

There was an in-game issue they needed to fix so they wanted to take advantage of the opportunity and address a couple of other things, namely a few improvements to experience gains.

What’s in this update?

• We've improved experience gains in older zones for players who are level 101 to 105.
• Experience bonus effects like Lesson of the Devoted and Bottles of Adventure will now apply to the experience rewarded on Heroic Adventure task completion.
• The amount of experience that mercenaries can gain on tasks has been increased dramatically.
• We’re adding new item to the Marketplace, Bottle of Adventure IV, which is a potion that grants +75% base XP.

Source