Unfortunately no huge news out of D23. A breakdown of the biggest reveals are as follows (as much as I can remember)
Tim Blake Nelson as Leader in Cap 4
Kingpin will have an eyepatch in Echo
Don Cheadle is returning for Armor Wars which Secret Invasion will set up. It'll be six episodes
Matt Shakman directing Fantastic Four
Cast of Thunderbolts is Yelena Belova, Ghost, Red Guardian, Allegra, Winter Soldier, US Agent, and Taskmaster
Ant Man 3 story is going to feature Kang kidnapping Scott's daughter
Two trailers were released: one for Werewolf by Night and one for Secret Invasion