Problem is that T'Challa ain't in it. From what we have heard and what's been said, he is being left behind and Wakanda is becoming the focus. Thing is, Wakanda was only Interesting when we experienced it with T'Challa, as it's been since his inception. Yet people are acting like Wakanda came first and is bigger than T'Challa. It isn't. It would be like Batman and Gotham but Batmans out of the picture.. Right as Batman was introduced and just started taking off.
My prediction is that BP 2 is basically going to be a origin story for the D+ show, and T'Challa will be just the footnote in his own franchise if they really stick to no recast. This ending the era of T'Challa the Black Panther before it even began