DreamWorks Animation, the studio behind the "Shrek," "Kung Fu Panda" and "Madagascar" movies, is in talks to sell the company to Japanese telecommunications firm SoftBank Corp., according to a person familiar with the talks. Jeffrey Katzenberg, chief executive of the Glendale studio, has been in discussions to sell the company he launched twenty years ago to SoftBank, which owns Sprint Corp. and recently dropped a bid to acquire T-Mobile.