The site says that story artist Mark Andrews (who also co-directed the Pixar short One Man Band) has taken over directorial duties.
Chapman previously directed The Prince of Egypt at DreamWorks.
Brave is being voiced by Reese Witherspoon, Billy Connolly, Emma Thompson and Julie Walters.
Opening in theaters on June 15, 2012, it is the tale of impetuous, tangle-haired Merida who, though a daughter of royalty, would prefer to make her mark as a great archer. A clash of wills with her mother compels Merida to make a reckless choice, which unleashes unintended peril on her father’s kingdom and her mother’s life. Merida struggles with the unpredictable forces of nature, magic and a dark, ancient curse to set things right.