Mike Donges of Mumbo Jumbo has updated his .plan. Donges had this to say about Myth III's release:

We have been a bit quiet over the last week, in order to capture feedback on the game. Believe me that we have been paying close attention to what we have seen and compiling a list of the issues and comments that have cropped up. MumboJumbo will be releasing a patch within the week to resolve a great number of these issues. This patch will focus mainly on fixing up issues that have plagued the MultiPlayer User Interface and some important compatibility issues. When it is ready for release, it will be available from Take 2's support website and we'll get the word out to you.

He goes on to comment on the Mac version of Myth III:

A word on the Mac version...it is very close, and MacSoft is gearing it up for the holiday season. They are as committed as us in getting it to the eager Mac users. The fact of the matter is that we ran into some unforeseen issues that have caused it to take us a bit longer to get it ready for release. I don't think that the few extra weeks of practice that the PC users have will do them any good once the Mac users start hitting GameSpy (this coming from an ex_Applite).

Nothing specific there, which is disappointing. Though, you have to respect someone who tells it like it is rather than just saying what the public wants to hear.