So on the bottom of the battlefield roles page, there's a blurb that detachments have their own rules. Today's article stated, "If we hadn’t decided to add Corvus Corax to the list, we would have needed an extra Retinue Slot for the Praetorian Command Squad and an extra Heavy Transport Slot for the Spartan." Which implies that Warlords/primarchs are compulsory for the Warlord apex detachment. So, there has to be more rules for a detachment in the new book that states the Warlord is compulsory.

So, Anonleaker, can you confirm or deny if there are any additional rules for each detachment?