Today we got a Japanese Civ7 update from Firaxis: More information about Meiji era Japan and a first look at Himiko as a leader.
Meiji era Japan is militaristic and scientific with a starting bias for coast and grassland. If you play Meiji, you get science boni from overbuilding old buildings, and a special naval unit which will respawn the first time it is destroyed. For more information please check here.
Himiko gets 2 personas, one from a DLC. The base game persona is diplomatic and scientific, whereas the DLC persona is diplomatic and cultural. Their agendas are the opposite of each other, depending on types of settlements. For more info please check here.