From the comments quoted in the media, it would appear that there will not be much more revealed in the accident report than has already been released.
Since the AAIB are only concerned with reporting established facts and not apportioning blame, any further details may only come out if there is a fatal accident enquiry.
Publishing the report on Friday will ensure any officials that might be targetted by the media for comment will be safely unavailable until after the weekend. A popular practice in government and civil service circles (been there, done that).
