Pending re-draft: the resource was re-drafted. The re-draft process will occur during the next publication. Re-drafting is irreversible. Several warning messages warn the user of this fact both when re-drafting, then when preparing to publish.
The Cancel re-draft option is available when the resource that you want to re-draft still contains links through other resources with the "Published" status. This option allows you to revert the "re-draft" process. The custom resources will then go back to their original statuses.
The Do not publish latest modifications field prevents modifications from being taken into account during future publications.