No – journalists had to leave their dictaphones and mobile phones behind when they were played the audio, and as far as I’m aware Mercedes haven’t published it.
I understand why they did it. Things are so advanced right now that teams can get to know what other are doing with their engines just by analysing the sound. I remember Red Bull were seen at Jerez last year recording the exhaust sound of various cars at the end of the pit lane. If any team got hold of a recording of the sound of the engine, it seems they would know what Mercedes is doing with the engine right away.