40 years after This Is Spinal Tap, the iconic fake documentary will be getting a sequel with its entire core creative team and cast. Rob Reiner, who directed the original movie, will direct the sequel and appear as Marty DiBergi, the fictional filmmaker who supposedly was making the documentary about the band Spinal Tap in the original film. All three core Spinal Tap actors — Michael McKean, Christopher Guest and Harry Shearer — are returning as well as band members David St. Hubbins, Nigel Tufnel, and Derek Smalls respectively. According to a press release, the sequel is now officially in pro…