So, near the end of Stormheim we find out that Sylvanas got some secret deal with Helya and at the end it turns out she wanted to enslave Eyir, Odyn's highest valkyr.
Then we venture into HoV and Eyir herself mentions this and how we lack honor and valor. Didnt she report to Odyn what has happened in Stormheim?
For the Alliance the whole situation would actually be a good thing (saving his valkyr and preventing an 'ally' of Helya from doing evil thing), but what about the Horde?
On a side note, looks like another plot hole now that Helya is dead. We probably wont ever find out what Sylvanas' part of bargain was (since Helya is gone, Sylvanas doesnt have to fulfill her part, and she probably wouldnt anyway since the lantern has been broken).