I noticed too in the preview it shows Echo falling (or being pushed ) off a cliff . If he dies (or is killed ) too , then all three were tailies . Not one of the original losties has been /will be killed off by Michael , or whoever is actually behind all this . I find this interesting . Like maybe the powers that be do not "need " them in their experiment or whatever, only the original losties are of value to them . Henry said he was comming to get Locke , if you believe anything that he says . And many of the tailies were taken /killed already according to AL .