I'm in the same position as yourself mate.
The selection board sits on the 23rd of March and you will be written to on the 24th/25th telling you if you were either "successful" or "unsuccessful" in being selected for May entry into BRNC. This applies to all officer candidates now, not just aircrew. If you need an aircrew medical for your role, your selection into BRNC will be conditional on a successful medical if you have not already been medically assessed for aircrew duties at RAF Cranwell.
I believe that the selection board for aircrew was intended to take place in mid-February but was pushed back. I was initially told that my early-February AIB date was the last available aircrew AIB for May entry, but the selection date got pushed back to coincide with the rest of officer selection, and as a result more aircrew candidates are to be in the running for May. I suspect that traditionally, aircrew selection takes place earlier than for other officer roles because of the extra layer of medical screening. Perhaps this is why you were expecting to have already heard but were not informed about the changes in selection dates.
Check with your ACLO as always. Best of luck with selection.