‘Wicked’ Spoiler Interview: Jon M. Chu on Expanding ‘Defying Gravity,’ Cutting Lines and Splitting the Musical in Two — Plus, Will Dorothy Pop Up in ‘Part 2’?

Jon M. Chu counted himself a fan of “Wicked” long before he was hired to direct the big-budget movie adaptation of the popular Broadway musical. So it was a question of where, not if, he should pay homage to Idina Menzel and Kristin Chenoweth, who originated the stage roles of Elphaba and Glinda, in the …