David Heyman has revealed that the Paddington Bear film is an origins story.
Colin Firth will voice the Peruvian bear in the upcoming film, which also stars Nicole Kidman, Jim Broadbent and Julie Walters.
David, who is producing the movie, said the story would go back to Paddington Bear's beginnings, saying: "He's got the little sign, 'Please look after this bear'. The Browns take care of him, he comes to London. We're on an adventure with him."
Hugh Bonneville and Sally Hawkins portray the Browns, who take the bear in, while Nicole plays a villainous taxidermist.
David, who has also produced the Harry Potter films and Alfonso Cuaron's sci-fi drama Gravity, said shooting on the film is under way, in time for a scheduled release in November 2014.
"It's exciting. We're on day 13 of shooting," he said.
"We've got a fantastic cast so it's all going really well. Colin's the voice of Paddington, Nicole Kidman's the baddie. It's pretty good and I'm one of the lucky ones."
Paddington is being directed and written by Paul King, from an initial screenplay from Hamish McColl.