Unfortunately, nothing new with the expansion... and unforutnately, anything else would be pure speculation. Personally, I think it's just a dead end, that Anet had considered using to expand gameplay, but ultimately decided to go with other options. Until they decide to re-explore the Gwen saga... there's not much point discussing the finer points of the lore.
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" Capital letters were always the best way of dealing with things you didn't have a good answer to."
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