There's a new sourcebook re courts and fortresses - https://www.fantasyflightgames.com/en/news/2019/3/1/courts-of-stone/

Perhaps more significantly, is the new adventure coming out; Winter's embrace - https://www.fantasyflightgames.com/en/news/2019/3/1/winters-embrace/

It'll be interesting how this ties up to the main storyline.

1. Winter Court is at Kyuden Doji.
2. Someone done officially invited Yoritomo.
3. I can think of no way at all this could possibly end badly for anyone.