Mike Donges has posted at MWA, updating us with the following information:

According to Take 2, the game should actually be in stores on the Tuesday the 30th (in the US). It may be in some stores on the 29th, so...call the store that you usually go to on the 29th. They may have it. If they don't, call other stores. Don't let them try to tell you that they have Myst III. That's not the one you want.

The European version has gone off for duplication, but I have absolutely no idea what the ship and store dates are for those versions. Thus far, we have integrated localization for French, German, Italian and Spanish.

The Mac version should be out within 2 to 3 weeks of the PC version. I know that won't be a happy-making thing for you Mac users out there, but that is pretty much out of our hands. The folks at MacSoft are pounding away trying to break the game as I write, so they are on the ball.

To be honest, I didn't think Mumbo Jumbo could ever finish the game as quickly as they did, so I am satisfied as long as the game makes it out this year (which it obviously will).