QuarkXPress Passport is the multi-language version of the standard or single language QuarkXPress. It contains all the features of the standard QuarkXPress plus additional support for multi-language publishing, including multiple dictionaries and a user interface that can be set for any of the languages supported by Passport.
QuarkXPress Passport files can be saved so that the standard single language QuarkXPress can open and read it. When saving a file, QuarkXPress Passport offers you the option to save the file as either “multiple language” or “single language”. If you choose “multiple language” only QuarkXPress Passport will be able to read the file. If you choose “single language” then the standard version of QuarkXPress will be able to open and read it.
If you didn't go to the Macworld conference and have not yet read the news about it, here are some articles you can read so you can get in the know...