The NDA regarding some topics is officially finished today and Microsoft has published an official document that answers many questions related to the Fall release of Dynamics 365 Business Central.
You can start reading from here. If you want to directly go to the cool part, this is the link.
Obviously, this is a work in progress.
You can help improving Dynamics 365 Business Central by discussing ideas, providing suggestions, and giving feedbacks by using the Business Central forum at https://aka.ms/businesscentralfeedback.