I don't think Vyranoth is gonna get a "redemption" arc, or atleast not survive it. We've heard from the devs that we'll learn more about the terrible actions of the primalists in the coming patches, and we'll presumably kill Fyrakk. Having killed two of her siblings isn't gonna make her suddenly good, especially after being imprisoned for thousands of years.
Yes, she might not agree with Iridikiron later down the line, but due to the sunk cost fallacy she'll still be on the side of the primalists, perhaps her own faction similar to the sundered flame.
Another route I see is Iridikiron absoring Vyranoth's power for the final patch.