The thing is as a lumineth player I wouldnt care very much, but it would be bad because I bought the first battletome and several months later I had to buy the second one... imagine buying a third one. But on the other part I want to have the full range of miniatures. So I dont know, personally it would be better late so I can paint all what I have.
Also, there is the Broken Realm story about Malerion and Morathi that says that Tyrion is aproaching Ulgu and it seems is going to be some kind of negotiation between them, so if we get Malerion we'll get Tyrion, not at the same time but the release could be near.