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<?php

/**
 * Modify the "Enter title here" text when adding new CPT, post or page
 *
 * @access      public
 * @since       1.0 
 * @return      void
*/
function rc_change_default_title( $title ){
     $screen = get_current_screen();
 
     if  ( '_your_custom_post_type_' == $screen->post_type ) {
          $title = 'The new title';
     }
 
     return $title;
}
 
add_filter( 'enter_title_here', 'rc_change_default_title' );
?>