I don't know if anyone has created a thread on this, and I don't remember seeing one.
When doing quests, you can change to a desired job (as long as it meets level requierments if there are any in place) to any job when collecting the rewards. This means you can go out do a bunch of quests and use that xp for lets say a DoL class. I am having kind of mixed feelings about this, but for the most part I like it. This will help crafters, and gatherers to try and keep up with the unrelenting pace of the combat classes.