Check out new character posters and a featurette marking the one-month countdown until Marvel Studios’ “Black Panther: Wakanda Forever” debuts in theaters nationwide. Posters are now available for all key characters, featuring Letitia Wright (Shuri), Lupita Nyong’o (Nakia), Danai Gurira (Okoye), Winston Duke (M’Baku), Florence Kasumba (Ayo), Dominique Thorne (Riri Williams), Michaela Coel (Aneka), Mabel…