I just got this out of the imgur link that the G5MC callsign site was updated/linked to...

http://i.imgur.com/sASdJBy.jpg

Edit coming with more information

Edit THE QR CODE CUT OUT: http://i.imgur.com/cZFveRw.png

So the page at http://qrzcq.com/call/G5MC was updated from the EiTo.wav file to the strings "em2Z512" and "Tgi7g5M." I haven't done anything with the latter, but I plugged the first one into IMGUR and got THIS image. In the bottom left there was clearly a QR code so I did a quick lighten of it. I'll see if I can get a better quality one ASAP.

EDIT

I just managed to scan the code, got an IP ADDRESS which is: 151.80.44.69

The IP address in fact traces to Paris. (This is apparently debunked)

It leads to a website as well with a text string with missing key letters, the text was from a JJ Abrams interview and the missing letters spell out "Patience."

Additional picture edit: http://i.imgur.com/5rLq6Ko.png

Edit: Text string when editing imgur image says > IHDR��   ��ÿ���’o‚ó���gAMA�ÈJ*aÁ��˙iCold Elf Rev I - cAlL Me��8Àc``û‡Ë‚‰ $¿¿PPTR‰‰•¿~ûÅçÅô

Potential new lead from XOR in picture: https://en.m.wikipedia.org/wiki/Exclusive_or