Producer David Heyman said that the "King's Speech" star's voice was "too mature"
Derek Cianfrance is directing the Dreamworks drama, which will also star Alicia Vikander
Reza Aslan's bestseller was first published in 2013
The live-action-CGI hybrid tale, with Colin Firth voicing the famous bear, had been set for Dec. 12
Derek Cianfrance ("The Place Beyond the Pines") will direct the movie for DreamWorks
David Heyman to produce with Jeffrey Clifford
Alfonso Cuaron directs the space thriller from Warner Bros.
David Heyman ("Harry Potter") is producing through his Heyday Films banner
"Harry Potter" producer David Heyman will produce the adaptation of the novel, which DreamWorks is looking to purchase
"The Help" and "Modern Family" take awards for best publicity campaigns; awards publicist Tony Angellotti wins top honor
On Horn's WB tenure comes to an end, producer David Heyman salutes his film's biggest booster