Problem
Help people differentiate "live" (or "original") revisions from imported revisions.
Proposal 1
We should make the Import feature in MediaWiki add tags like import and importupload to the imported revisions.
Proposal 2
(From a brief TechCom triage meeting, by no means substantial yet or otherwise better, merely an idea). We could derive this information based on the imported username or user/actor type being indicative of an imported revision.