According to Ghibli World, the English dub version of Miyazaki, Hayao
's movie "Ponyo on the Cliff by the Sea"
(Gake no Ue no Ponyo) will be shown in the US theaters in 2009. The English dubbing will be directed by Frank Marshall and Kathleen Kennedy ("Indiana Jones" series). The announced English dub cast is as follows:
It's not announced who plays which role.
Source: Coming Soon.net