According to ausbt, they are handing out $30 vouchers to use at airport cafes: Source
It seems like they will be opening it later this afternoon:
UPDATE | A Qantas spokesperson tells Australian Business Traveller that the Qantas Club, Qantas Business Lounge and Chairman's lounge at Melbourne Airport will all re-open later this afternoon after a fire broke out in the Qantas Club kitchen this morning.
I'll be there this evening, hopefully it is open by then!