Nautilus on 13 January 2017
Before people go with high expectations, its very likely this is only about Fire Emblem Warriors.Most likely getting a trailer, gameplay videos and developers talking how this came to be.Plus hopefully launch date/window.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1
