Heavy-hitters like Drew Goddard (The Cabin in the Woods, X-Force) and Guy Hendrix Dyas (Inception, Indiana Jones and the Kingdom of the Crystal Skull) were brought on to write the script and start working out the movie's designs respectively. Chris Hemsworth and Anne Hathaway were cast and a release date was set for April 2015, but the project was put on indefinite hold because the screenplay wasn't ready and too expensive to shoot, anyway.
This past March, Spielberg handed over the reigns to Michael Bay (Transformers), but he's far from done with the adaptation. While being interviewed for AMC's docuseries James Cameron's Story of Science Fiction, the director revealed that he's still trying to hardwire Robopocalypse into existence.
"I've been working for years on Robopocalypse," he told Cameron. "Because it's this story of the most profound sentient chromatin of man who basically is so much smarter than man, he needs to wrest control away from the human race and take over the world — a little bit like Pinky and The Brain. But it's scary."
That analogy might seem strange to some, but Spielberg was an executive producer on the Animaniacs, where Pinky and The Brain originated.
Similar to Max Brooks's World War Z, Robopocalypse (written by Daniel H. Wilson) is an oral history of humanity's war against a seemingly-unstoppable army of machines being controlled by a child-like A.I. called Archos. Switching between different perspectives and methods of storytelling, Wilson's novel certainly contains enough content for an epic film and there's even room for a sequel since Wilson penned a follow-up, Robogenesis, in 2014.
All quotes are taken from the book that ties into James Cameron's Story of Science Fiction on AMC.