Linked Revisions provide a level of traceability, but are used when revising or copying a whole project where a separate and uniquely identifiable record is desired. Much like Master Projects, for the first time the Enterprise is now able to support this feature to display the stored relationships across a company-wide database.
The 'Linked Revisions' browser tab seen here is only displayed for Linked Revisions, and lists projects created with a linked relationship to the current project - including business-wide Enterprise setups