There are only a few facts available and all else is speculation that is not proven to be right so far.
One of the "facts" that has been circulating for some time is that the a/c turned at two or more waypoints after IGARI. At the press conference just now someone asked what was the evidence for this "fact". The head of the CAA blatantly evaded the question replying that the emphasis is on searching for a/c, ie I think indicating that there is no evidence. As previously noted here, the origin of this "fact" is Reuters quoting an unnamed source.
Part of the problem is that interesting facts only emerge under questions from journalists. If the journalists don't ask the right questions, facts don't emerge.
I don't altogether blame the Malaysians for this. The more they tell, the more we will want. Perhaps we should just leave them to get on with their job.