I would guess the police will need to await the Coroners verdict before they may consider investigations for any criminal acts which may have led to the deaths of the occupants. The coroner in adjourning the hearing may well have decided to wait for the AAIB report.
I think it is more likely that the Coroner will wait for the police report, to have all available evidence before him. The purpose of the inquest is not to apportion blame, indeed the rules specifically state that no civil or criminal liability can be specified against any named individual.