DAoC's Technical Lead Destin Bales dropped by the Vaults Tech Tavern forum and helped clear up a question about the DAoC Gold Edition pack that went retail last week:

The Gold Edition includes the original game as well as Shrouded Isles in one package (and with one combined CDKey). This product is for folks who have either never played Dark Age of Camelot before and wish to have all of the latest goodies, or for people who would like an additional account with SI access. Foundations will be a free optional download for all existing players whether they have Shrouded Isles or not. The Foundations expansion is all housing and does not include SI. As for Atlantis I am not sure what will physically be on the CD. As soon as something is set in stone I'm sure it will be posted on the Herald.