I really hope that he already recorded his dialogue for What If...?, mostly because him as Panther is such a huge, important role to so many people and I want Marvel to be able to attach a dedication to him on a project that he was actually involved in, if that makes any sense. I feel like getting a dedication for him on a project where he's playing T'Challa one last time, even if it is just animation, is important, considering all that he and the role have done to inspire people around the world.
God, this whole situation is so tragic. So young, and he had such a bright future ahead, but he really did leave such an important mark in the projects he did get to tackle in his all too brief time. His portrayal of Black Panther alone is something that will ripple for years to come, and then with projects like Da 5 Bloods, which so far has been my favorite movie of the year...