Morgen has been developing the as-yet-untitled documentary with the Nirvana frontman's widow Courtney Love for the past five years, and reckons on a 2014 release, reported Sun online.
"It'll be an embodiment of his character. If you think about Kurt, he's a contradiction. He could be sincere and sentimental, and also ironic and sarcastic. He was sweet and sour. He was incredibly funny, too. The film has to reflect his spirit," he said.
'Crossfire Hurricane', which documents key periods in The Stones' history, will be out on DVD from tomorrow.