Iron Man's MCU replacement has been set up to have a key role in Phase 6, particularly if Armor Wars continues on directly from Phase 5's Secret Invasion. After Robert Downey Jr.'s Tony Stark, a.k.a. Iron Man, sacrificed himself to the save the universe in 2019's Avengers: Endgame, a huge void was left in the MCU, with several new and established superheroes fighting to become the perfect legacy hero to the original armored Avenger. As well as introducing Dominique Thorne as Riri Williams, a.k.a. Ironheart, in Black Panther: Wakanda Forever, one upcoming MCU project proves just how important Stark's oldest friend will be in continuing Iron Man's MCU story.
https://screenrant.com/marvel-armor-wars-secret-invasion-rhodey-iron-man-4/