Also haven't been paying much attention to to the extra modes, but have they mentioned if this is going to have something similar to the Adventure maps from Hyrule Warriors?
It would be great if the equivalent was something like the strategy-based phases from Samurai Warriors Empires.
There's multiple faction and phases, and you have to defend your territory from invasion while also expanding your own.
There's a preparation phase where you appoint members of your army and put them in charge of various resources or political dealings. It would fit really really well with the emphasis on strategy that FE is known for.
Then again, the first part wouldn't really fit, cause there would need to be multiple factions for the defense/offense part to really work, and I don't see this game doing that.