TLDR: Chris Evans is officially set to return for Avengers: Secret Wars in 2027.

The Big Announcement Was Made Through a Voice Message For a Fan
The news was confirmed through a voice message Chris Evans left for a fan, which was later shared on Instagram on Mar 26.
In the message, Evans hinted at his involvement by revealing that he would be starting work on the next Avengers film within a few months.
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From Retirement to Return
Evans last portrayed Captain America in 2019’s Avengers: Endgame, after which he repeatedly stated that his time with the character had come to an end.
Although he made a surprise appearance as Johnny Storm in Deadpool & Wolverine, his return as Steve Rogers was first teased in promotional material for Avengers: Doomsday.
The Doomsday footage suggests that Steve Rogers has retired from superhero life. He is shown putting away his Captain America suit and embracing a quieter future, including starting a family with Peggy Carter.
What to Expect From Chris Evans in the MCU
The next Avengers movies are set to reunite several major Marvel stars, including Robert Downey Jr., who is returning to the franchise in the role of Doctor Doom rather than Iron Man.
Steve Rogers’ experience and leadership could make him a key figure in the battle against the new threat facing the Marvel Universe.
Interestingly, promotional material for Avengers: Doomsday refers to Evans’ character simply as Steve Rogers rather than Captain America.
This has fueled speculation that Anthony Mackie’s Sam Wilson will remain the MCU’s primary Captain America, while Steve may return to the iconic mantle one final time in Avengers: Secret Wars.