According to Variety, Jason Momoa is joining the cast of the Dune reboot. It would explain what he was doing at Legendary Entertainment in his Instagram story from this week. 14DB8672-D75D-412B-A85A-FB3ADF5C00FE From Variety: “Aquaman” star Jason Momoa is in negotiations to join Legendary’s “Dune” reboot. If a deal closes, he would join a cast that …