According to the announcement Microsoft made, Age of Empires IV is under development. The game is developed by Relic which was the studio behind the games like Dawn of War and Company of Heroes.
Also, Microsoft shared an announcement trailer for Age of Empires IV. Here, take a look:
But, wait! There is more! Another announcement about Age of Empires has been made. Age of Empires: Definitive Edition is also on the way.
Age of Empires: Definitive Edition will be out on October 19. The Definitive Edition is the classic strategy game with new features such as 4K graphics,expanded user interface, a re-orchestrated soundtrack, 250-300 population capacity, Attack Move and many more.