If Jag isn't going to die, my money is on Zekk or some other new character. Kind of like Tahiri being reintroduced in Conquest without any introduction for people who hadn't read JJK. After all, in Ruin, Jaina was supposedly all broken up about her wingmate Anni dying and we only ever read a couple of lines about her. But I do so want it to be Jacen. To die in an utterly ignominious fashion, and then Jaina deciding that the whiny little brat just isn't worth the trouble. But we all know that isn't going to happen. If a person's got 'Skywalker' or 'Solo' attached to their name, they can do no wrong.