Jilted
For some unknown reason MAS has never released the preceding few transmissions leading to the last transmission causing all this speculation
MAS is an airline not the NTSB/AAIB/BEA. It is to the official state agency in charge of the aircraft accident branch to release such informations. This official state agency asks the agency in charge of the ATC to give them the transcript for a possible, or not, later public publication. This is an ATC communications not OPS ones. And we are still waiting. In the AFR447 case, transcripts were published by the Brazilian authorities rather quickly and, in this case, nothing yet.