So it hasn’t really been revealed “how” we are getting our elite spec afaik, but with the heavy emphasis on Ascension and the Forgotten towards the end of living story season 2.
What if it unlocks through the story after we go through some ascension ritual process, whether that be like the doppleganger from gw1 or something different, and once we beat it, we unlock new hidden abilities.
I have a feeling Rytlock will put us through this ritual as well, and will be the story behind him unlocking his abilities of the Revenant.