CA has released a new faction feature, detailing the religious Uesugi clan:
The mon of the Uesugi clan.
Quoted from Total War Blog:
The Uesugi are proud of their Buddhist faith. They can recruit and maintain warrior monks far more cheaply than any other clan. They can also recruit much better fighting monks and more effective monk agents than any other clan. Despite this religious solidarity, the history of the Uesugi is not tranquil. The current Uesugi leaders were originally the Nagao clan of Echigo, and were vassals to the Yamanouchi faction of the Uesugi clan. The Nagao fought alongside their masters against the Ogigayatsu, another part of the Uesugi clan, in a bitter dispute.