I don't think this has been mention and it might be a far stretch, but...
Recently it has been announced that Valve's Steam is coming to Mac Os X.
They are porting a bunch of their games to run natively on the Mac.
Maybe (read: unlikely) Lorne has decided to also make the oddbox available for the Mac. The Os X version of steam will be released next month, so maybe we'll know more then.
Once again this is just a possibility and probably not the reason for the delay.
(ow btw, I'm new here !!! Wanted to join for a long time, finally decided to do so)
Cheers,
Brun
http://www.bruncroes.blogspot.com