From what I've read, Nathan might get kidnapped (strange, I know, but I'm just going with what I've read). Lucas is only going to see Haley and Jamie when he comes back, so I'm thinking he's coming back to help find Nathan. Maybe he has to take Lydia inicial with him to protect her? I don't know. It all sounds a little weird, but I guess we'll all just have to wait and see how it plays out. All I'm hoping is that naley gets their happy ending!