Myth III: The Wolf Age, the prequel to Myth and Myth II, is currently being developed by Gathering of Developers.
Myth III is set 1,000 years before Myth, MacNN reports.
Both previous versions won praise from Mac and gaming magazines, and attracted a huge number of fans.
There are hundreds of Myth and Myth II Web sites built by dedicated gamers.
The Myth series was acquired from original developers Bungie by Take Two Interactive last year. At the same time, Bungie became an independent business-unit of Microsoft. It is thought the game will be formally announced at Macworld Expo, San Francisco.