Jquery and Drupal Autocomplete
If I want to display in autocomplete all this field I will use hook_form_alter
I will change the value of autocomplete with another function 
so this is what i will do

function hook_form_alter() {
  $form['field_selectedarticles']['und'][0]['nid']['#autocomplete_path'] = 'autocomplete/filteration';
}

function autocomplete_filteration($string) {
  //select * fields I want
  print drupal_json_output($items);
}