change-title-placeholder-custom-post-type.php

<?php
// Change ‘Enter Title Here’ Text For Custom Post Type
// http://wp-snippets.com/change-enter-title-here-text-for-custom-post-type/

function 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', 'change_default_title' );