I hope this is the right forum, and it's okay to link to other sites. If not, I apologize.
Over on the Stormlight Reddit (https://www.reddit.com/r/Stormlight_Archive/comments/absjnj/stormlight_book_four_update_1/) Brandon posted his first update for book 4. I won't quote the whole thing, but he mentions spending the first two months starting yesterday creating an outline, then possibly posting a spoiler free version of it like he did with OB. He also mentions that a part of Kaladin's WoR