A new Avengers: Doomsday and Secret Wars rumor could have revealed a major twist for Black Panther 3. (Photo Credit: Marvel Studios)What could the Avengers: Doomsday and Secret Wars rumor mean for Black Panther 3? The underwater kingdom of Talokan was introduced in Black Panther: Wakanda Forever. Marvel has already announced that Ryan Coogler will continue with his direction for Black Panther 3. After Avengers: Secret Wars arrives on December 17, 2027, Marvel Studios will move forward with Black Panther 3, which releases a year later on December 15, 2028.