that book Wanda was reading at the end , The Darkhold , the book of the dammed , has always cost the souls of those who have read it
the book will play a large roll in the MCU going forward , mostly with upcoming shows /. movies like Blade and Moon Knight , and probably even Ghost Rider , as these are all creatures of the Dark
and something to keep an eye on from Falcon and the Winter Soldier , that city we see in the Trailers is "believed" to be Madripoor , a fictitious city near Singapore
in the comics that cities underground is a hot bed for Mutant activities , Wolverine hangs out there alot , as do many other Mutants
I'm not saying Wolverine , or any other Mutants are going to show up in Falcon and the Winter Soldier , but I imagine there will be Easter Eggs for things to come, so keep your eye out for clues
just a city to be aware of , as it could have a large part to play in the MCU