Quentin Tarantino is wandering the globe, beseeching studios and stars (Brad Pitt, Leonardo DiCaprio) to join his much-delayed WWII epic Inglorious Bastards. Tarantino first started working on the movie in 1997, but it’s hardly the longest-simmering artwork out there. What other much-awaited projects are nearing completion in the worlds of rock, opera, theater, and visual art? And what might become of them?