I'd love to see a badge for 'official' accounts, similar to verified Twitter accounts.
Unless we see an influx of impersonators (e.g. theymos-official or real-theymos), we don't really need those badges for now.
Using PGP might do the trick, though I doubt it's really urgent. Post history and trust history should be enough to identify if somebody is an impersonator or not imo.
Anyway, looking forward to the reporter badge being implemented.