Here is a little bit of what's going to be shared according to the linked post.
Age of empires II, III, IV and Mythology. New expansions, DLC's seasons and game.
-Age of Empires II: Definitive Edition: We’ll reveal a brand-new campaign-focused expansion and an extended look at exclusive gameplay.
-Age of Empires III: Definitive Edition: After giving our players a new way to play for free in 2023, we are excited to reveal a new DLC with new civilizations.
-Age of Empires IV: Coming off our best-selling expansion ever with The Sultans Ascend, we will share updates on an upcoming brand-new season and a new in-game reward.
-Age of Empires Mobile: TiMi Studios, the award-winning developer, will share a first-time look at gameplay and give us a behind the scenes look into their studio. The team will share their passion for Age of Empires and their vision to bring the franchise to new and existing fans alike.
-Age of Mythology: Retold: The team will take us behind the curtain in the studio to show how they are developing this beloved game for a new, modern experience. Fans can expect a unique unveiling of a few mythological creatures that you won’t want to miss.