Florence Pugh will continue to portray Yelena Belova in Avengers: Secret Wars. Marvel Studios president Kevin Feige also hinted that Yelena could be a central character in Avengers: Doomsday. With the special re-release of Avengers: Endgame, the newly added footage provides context for this multiversal crisis.
Vanity Fair's interview with Pugh confirmed her return in Avengers: Secret Wars. The interview also touched on Avengers: Doomsday, with Feige hinting that the film will feature Yelena as a key figure, rather than just a cameo or minor supporting role.
Yelena previously became the leader of the "New Avengers" in Thunderbolts*. New footage added to the special re-release of Avengers: Endgame revealed that Steve Rogers used the Infinity Stones to alter the Sacred Timeline for his own happy ending, triggering the collapse of the multiverse. Different worlds began colliding, putting heroes' survival at risk.
These changes continue to unfold. At the start of Avengers: Doomsday, the Time Variance Authority has discovered thousands of worlds dying simultaneously, with Earth-616 facing the same threat. Avengers: Doomsday is scheduled for release on December 18.