Your scepticism is understandable, but in view of the joint teams invited to participate, one would still expect a fairly decent report within a respectable time frame.
An international team dispatched to examine the plane’s recovered data and wreckage included four representatives from the U.S. National Transportation Safety Board, four employees from Boeing, two officials from the Federal Aviation Administration, and an aircraft engineer from GE Aviation. Two investigators from Singapore’s Transport Safety Investigation Bureau are also helping with the probe in accordance with a cooperation agreement among member states that make up the Association of Southeast Asian Nations