The Hollywood Reporter says that Eva Marie Saint (pictured on the left here) has joined the Superman cast:
Eva Marie Saint will play Martha Kent, the adoptive mother of Clark Kent/Superman in Bryan Singer’s Superman film for Warner Bros. Pictures. Brandon Routh is playing Superman. Saint, who starred in the Alfred Hitchcock classic “North by Northwest,” co-stars in Wayne Wang’s “Because of Winn-Dixie,” to be released by 20th Century Fox on Feb. 18, and will also appear in Wim Wenders’ “Don’t Come Knocking,” to be released by Sony Pictures Classics in the fall.
Source: The Hollywood Reporter