The “Wicked” sequel “For Good” may not be hitting cinemas until Nov. 21, but director Jon M. Chu dropped by the BFI London Film Festival on Friday to offer a special sneak peak of the follow-up to Universal’s smash hit musical adaptation. The director debuted a brand-new clip for the audience of his LFF for Free talk, featuring Elphaba (Cynthia Erivo) visiting Glinda (Ariana Grande) on her wedding day. The emotional tease sees the two secretly reunite after the events of “Defying Gravity,” with