And in the 5.0 Prelim notes, there is indeed and extra quest after completing all of the role quests and 5.0's msq.
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What caught my eye (as a SCH main) is that the role quest for Healers, featuring "Lamimi", has her in what looks like her Source appearance. As in no helmet, which is apparently super-important to Dwarfs on the First. (We only see her back, so I don't know if she has a beard.)
Given the title of her Role Quest is "Traditions and Travails", it might have something to do with that, ie Lamimi breaking away from Dwarven traditions.
Well before becoming the WoD, she still had the same appearance but had her White color version of the WHM job clothing. I still think that this maybe current events and the Arbert and his companions are still alive. High chance they are no longer mortal beings but still "alive" in a certain way.
We will find out once we start playing 5.0.
I think its both their journey before they became the WoDs and what happened after their 'return'. The slide introducing role quests in the live letter had the WoDs in basic adventurer gear in what seemed like an Echo flashback, while the pics in the prelim notes have the dwarf healer fighting and defeating a Sin Eater, which are coming from the Flood of Light AFTER it was halted.
In the slide from the media tour live letter, there was a picture of the WoDs in basic adventurer gear. 'Lamimi' appears to be there, since the healer is a dwarf wearing the dwarf helmet and beard, so I think the removal of the helmet came with the 'abandon their bodies' thing.
Without spoiling anything, the Healer Role Quests directly address Lamimi's non-dwarvy proclivities, along with many of the other things discussed in this thread. While I haven't completed those role quests just yet...
Spoilers:
Ardbert and his crew are widely vilified on the First, and considered the instigators of the Flood of Light. None of them are alive; they all died a century ago. Ardbert is present in the storyline as a ghost, and the others show up in the Role Quests somehow transformed into an unusual variety of Sin Eater. Even aside from being vilified in general, Lamimi is particularly reviled by other Dwarves for taking a big, fat dump on Dwarven tradition by parading around helmetless and bare-faced. However, she DID wear a helmet (and sported a beard) when she first met Ardbert...