I've seen speculation on this before but not recently. Is the Pale Tree a dragon? She is the uncorrupted spawn of Mordremoth but does that quality her as a dragon. She started from a seed but wouldn't Mordremoth reproduce with seeds? Mordremoth's core was tied to a tree in Dragon's Stand. It seems to me that the evidence is strong enough in favor of her being a dragon.
With Kralkatorrik ravaging the Mists I think it would be interesting if the Pale Tree started rescuing important souls and putting them in the body of new Sylvari. It would be really interesting if those Sylvari were plant versions of the original characters. Like Tybalt being in the body of what looks like a Sylvari / Charr hybrid.