First, Pardot is introducing a “Permanent Delete” feature for Prospects. Pardot Admins will soon be able to delete all Prospect information and associated engagement from the Prospect Recycle Bin. More information will be available shortly on the Pardot blog so stay tuned.
Second, Pardot will no longer track activities on archived prospects (those in the Recycle Bin). Additionally, prospects will not be unarchived automatically unless they take an explicit action like filling out a form or unless a Pardot/Salesforce user takes an explicit action on the associated prospect record.