According to Assassin's Creed: Unity, the Secrets of the Revolution include a rather fetching coat.
Assassin's Creed: Unity has a new premium DLC pack on offer, just in case the free Dead Kings expansion didn't satiate you.
Secrets of the Revolution includes three missions, nine weapons and five pieces of equipment. The missions are called “The Chemical Revolution”, “The American Prisoner” and “Killed by Science”.
The pack is available now on PC and Xbox One so I expect it will arrive on the PS4 in this week's update, which should go live in North America shortly.