Haha, the chinese players are all lobbying together for more dragons for TC.
It looks like KO is already preparing something for you. Among the things that may surface as units at some time are Kojin, Fujin, Myoo, Amatsu-kami, Kunitsu-kami, Kuraokami... Description slots for those have been added in 3.21. Maybe they are for Yomi or Jomon, but they might be for TC, too, dunno. As for dragons, there have been slots added for Celestial Dragon and Dragon King of the East/West/North/South. Those look like they'll be accessible to MA and LA (The Dragon King of the East "is known as Owatatsumi in Jomon and Au Guang in Ti'en Ch'i"). So there's a chance that KO will expand on the theme of dragon courts later.
Take all this with a grain of salt, though. There already is a national hero, Ryutaro, the son of the Dragon King of the East, since the release of Dom3, and traces of a magical item named "The Dragon King's Heart" which never surfaced yet. So when or if all this might make it into the game is totally uncertain and up to KO.