India, Nov. 18 -- The witches of Oz are back, and the finale goes darker as Cynthia Erivo and Ariana Grande anchor a visually sumptuous, song-filled showdown. Does this hotly tipped sequel cast a spell strong enough for Oscar glory, or will its length test audiences' patience? Berlin (dpa) - Billed as one of the pop culture highlights of the year, the finale of the musical film "Wicked" about the contrasting witches Elphaba and Glinda opens in cinemas with a darker, more serious tone - and is already being touted as an Oscar contender. As with last year's first instalment, "Wicked: For Good" is again being floated as a possible Academy Awards hopeful, particularly for Grammy winner Cynthia Erivo and US superstar Ariana Grande. The sequel is...