It will be stylized to fit four different cultures and allow Kings and Emperors to take petitions from subjects, some petty, others more important for the realm. You will be able to view the throne room, which acts as a 'glorious bridge between the map, on one hand, and the character, on the other,' from different angles. It's, in one sense, a reward for players who climb the ladder of titles, as only Feudal and Clan rulers that ascend to King or Emperor rank have access to it.
In-game, the Royal Court will receive its own new hub, where you can see 'the fruits of your success,' your family, but also courtiers and vassals paying homage to you. The main feature of Crusader Kings 3: Royal Court gives the expansion its title.
Ideally, Paradox wants to avoid situations in which players encounter hurdles after a major DLC launches and strives to make it easy for players to jump right in without feeling lost. Crusader Kings 3's expansions aim to evolve the game in new directions while being integrated with its already established features.