Haulers and escorts now carry a big gold wagon badge above their names, and raiders a big red crossed-blades badge, so you can tell who's who from a distance.
Marked players in the Lampless Reaches now carry a big red skull above their names.
Anyone who attacks you shows up in red with a health bar for the 30 seconds you can fight back, even if they aren't flagged.
Health bars now only show on players you can fight right now, or who are fighting beside you. A flagged player out of your reach no longer shows one.