My suspicion is that we'll get our answers after that shot through the chest. I think that was a forced echo from the wyrm lord, with the battle with him actually ALL being an echo. Note that he and the dragons in the fight all have that ethereal blue aura. Given that he's looking to be the main antagonist of the expansion (based on the logo) he should be well beyond our ability to fight at this point... but an echo would be a fantastic opportunity for some exposition and a teaser fight for the real thing later on.
