After the (disastrous) launch of the Great Negotiators pack, a reddit user has datamined the abilities, as well as the rough models of Tokugawa and Nader Shah.
Remember, the abilities for both Nzinga Mbande and Julius Caesar went through major changes in development before release, so take this with a grain of salt.
Tokugawa leads a cultural yet isolationist Japan, doubling down on the concept of compact empire and closely knit districts
Tokugawa
Persia is now less of a stealthy opportunist. Under Nader Shah, Persia loses major edges in combat from Cyrus' abilities, but is still encouraged to participate in warfare to establish a wide and bustling empire which mounts on the power of domestic trade routes.
And lastly, Suleiman the Magnificent. Losing both Ibrahim and the Janissary, Suleiman now becomes more versatile than ever before. He will now wage wars in Normal and Dark Ages so his empire can thrive in peace during Golden Ages.
Suleiman the Magnificent