How often are tag wiki excerpts migrated into the tag popup windows?
I ask because I edited several tags and didn't notice any change to the text produced in the popups (either showing the old lower-quality text, or nothing at all in the case that there was previously no tag wiki).
I suppose it could be a browser caching issue. Theoretically. But if so, it's a puzzling one. I'd be much happier if it was something more prosaic like “a cron job rebuilds it daily” or something equally mundane. After all, now that so many people can propose tag edits, the cost of keeping this previously largely-static part of the site up to date would be rather high.