Genre-leaping keyboard legend Herbie Hancock has an update for fans eagerly anticipating his new album — originally due out in 2020 — featuring Pulitzer Prize-winning rapper Kendrick Lamar, West African guitar innovator Lionel Loueke, Indian tabla master Zakir Hussain, saxophonist Kamasi Washington, electric bassist Thundercat, producer Flying Lotus and such hip-hop mainstays as Common and Snoop Dogg. “I tried to complete that record several times. But before I could finish it, I didn’t like it anymore and had to start over from scratch,” said Hancock, an Oscar-winning film composer, 2013 Kenn…