- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
    [picker dismissModalViewControllerAnimated:NO];
    NewViewController *viewController = [[NewViewController alloc] init];
    viewController.image = image;
    [self presentModalViewController:viewController animated:NO];
}
また、iOS 5.0 以降を使用できる場合:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
   [picker dismissViewControllerAnimated:YES completion:^(){
        NewViewController *viewController = [[NewViewController alloc] init];
        viewController.image = image;
        [self presentViewController:viewController animated:NO completion:nil];
    }];
}
UIViewController Class ReferenceでAppleのドキュメントを確認してください