I wouldn't waste any time or money on it for the same reason I wouldn't waste any time or money to see a movie about Malcolm X played by Nicolas Cage.
Not really the same thing since Superman is a fictional character, whereas, Malcolm X is not.
Don’t know why people gotta be so mad about a fictional character.
I will say that it seems to make more sense for them to create a new Superman that happens to be black rather than make Cal-El black. Maybe that’s what they will do.