As GameTap is not yet (will not ever be?) available for the Mac, TransGaming Inc. will be in charge of porting the title over (using their Cider product we presume). With not so much as an estimated time for this release, Mac users will be left sitting on their hands until further information is revealed ... or discovered in a mysterious book. Those in the nether realm of the PC, however, will have new content to enjoy as soon as tomorrow with the release of the Great Zero area to explore.
With a brand new platform of users to engage and a continued push of content, Uru sure has come a long way from the days of Ubisoft's waffling. If Mac gamers are really dedicated (and/or impatient), there's always Boot Camp to get your GameTap fix.