Marvel Rebirth

Marvel Rebirth is a relaunch by Marvel Comics of its entire line of monthly superhero comic book titles. It restored the Marvel Universe back to before All New, All Different.

Changes to the Marvel Universe
To prevent the destruction of the entire universe, Peter Parker was forced to reverse the deal he made with Mephisto. This resulted in May's death and the restoration of Peter's marriage to Mary Jane. This also led to other events being retconned.

Characters replaced were restored into their original roles, including Tony Stark, the original Thor, Steve Rogers, Bruce Banner and Wolverine. Newer characters like Riri Williams and America Chavez were rewritten or written out.

Avengers
After James Rhodes' death, his niece, Lila Rhodes has become the new War Machine.

X-Men
Mutants have become more widely accepted. The Brotherhood have disbanded but in their place is the Mutant Majority led by Malcolm Stevens, a mutant with electrical powers. Cyclops leads the X-Men against the Mutant Majority.

Ultimate 2.0
Marvel also rebooted its ultimate universe.

Star Wars
The Star Wars line was rebooted, incorporating the Crim Timeline.