Peacock is launching not one Fast & Furious TV series, not two — but four , franchise star Vin Diesel said Monday at NBCUniversal’s upfront at Radio City Music Hall in New York City. Or maybe it is just the one. “For the last decade, we have realized that the fans have wanted more,” Diesel, sharing the stage with Jimmy Fallon, told the advertisers in attendance. “They wanted us to expand the legacy characters, their stories. And for the last decade, the desire has been for us to enter the TV space.” “The news that I have here today is that Peacock is launching four shows from the Fast and Furious universe,” Diesel said. Or is it? A source inside Peacock tells The Hollywood Reporter that only one Fast show is in active development. Diesel said he had to wait until the timing was right to bring Fast & Furious to series. When Donna Langley added TV oversight to her purview, the timing became right, he explained.…