It looks like Letitia Wright will be taking up the 'Black Panther' mantle post-Chadwick Boseman.
In the latest trailer for 'Wakanda Forever' it appears to confirm that Shuri, T'Challa's sister in the film series, will become the 'Black Panther'. This aligns with the comic series, where in the 'Black Panther' comics, Shuri actually assumes the role for a while.
After Chadwick passed away in 2020, Marvel refused to recast the character, so this is the route they've chosen.
Wakanda Forever!