I have just been on the phone to Jetstar. They have suggested that given the circumstances are out of their control they are only required to give a credit. I think that only changes 'within their control' are entitled to a refund.
Oh Wow! I have never been in first class lounge. It would be an amazing experience. We are travelling QF49 from Melbourne. 2 adults 2 kids. I would love 2 passes.