It has finally been announced on Universal Orlando's official Facebook page:
We wanted you to be the first to know, Florida fans. The first preview of Universal's Cinematic Spectacular: 100 Years of Movie Memories will be this evening! The new nighttime show, in the Universal Studios lagoon, highlights 100 years of the most fun, dramatic & awe-inspiring moments in film. While previews have begun, the show will only run on select nights until its official grand opening on May, 8.
We will visit the park very soon to bring you a complete video of this great new show! Stay tuned.