the evidence simply lie with the pings. the handshakes that we have analyzed. that's all we have. >> reporter: the malaysian prime minister in an exclusive interview claimed that investigators have not had much to go on. he's promising to release a preliminary report on flight 370 investigation next week exactly seven weeks after the plane vanished. many of the relatives of those that were on board are very skeptical. >> actions speak louder than words. the briefings have been a joke. >> now, what is not clear, wolf, is whether or not they have any more math to go to, basically, the way that they picked up the pings and how they map where they are searching right now, where will they go next? will they just continue to search around the edges, go to the area of the first ping or reset the entire operation for a