Drupal hook to get the Display Suite field group attributes input option to use tokens. NOTE: only works in template.php i believe, and not modules.

template.php

<?php
//@file template.php

/**
 * Implements hook_field_group_pre_render_alter()
 * Add token support for field group attributes
 *
 * NOTE: this is basically a copy/paste of field_group_pre_render_html_element()
 *       from the field_group module with some changes
 *
 * @param mixed $element
 * @param object $group
 * @param array $form
 */
function template_field_group_pre_render_alter(&$element, $group, & $form) {
  $entity_type = $form['#entity_type'];
  //Fallback for field collections
  $entity = isset($form['#'.$entity_type]) ? $form['#'.$entity_type] :$form['#entity'];

  $html_element = isset($group->format_settings['instance_settings']['element']) ? $group->format_settings['instance_settings']['element'] : 'div';
  $show_label = isset($group->format_settings['instance_settings']['show_label']) ? $group->format_settings['instance_settings']['show_label'] : 0;
  $label_element = isset($group->format_settings['instance_settings']['label_element']) ? $group->format_settings['instance_settings']['label_element'] : 'div';
  //NOTE: This is the line of code that is altered from original function
  $attributes = isset($group->format_settings['instance_settings']['attributes']) ? ' ' . token_replace($group->format_settings['instance_settings']['attributes'], array($entity_type => $entity)) : '';
  $group->classes = trim($group->classes);

  // This regex split the attributes string so that we can pass that
  // later to drupal_attributes().
  preg_match_all('/([^\s=]+)="([^"]+)"/', $attributes, $matches);

  $element_attributes = array();
  // Put the attribute and the value together.
  foreach ($matches[1] as $key => $attribute) {
    $element_attributes[$attribute] = $matches[2][$key];
  }

  // Add the classes to the attributes array.
  if (!isset($element_attributes['class']) && $group->classes) {
    $element_attributes['class'] = $group->classes;
  }
  elseif (isset($element_attributes['class']) && $group->classes) {
    $element_attributes['class'] .= ' ' . $group->classes;
  }

  $attributes = drupal_attributes($element_attributes);

  $element['#prefix'] = '<' . $html_element . $attributes . '>';
  if ($show_label) {
    $element['#prefix'] .= '<' . $label_element . '><span>' . check_plain(t($group->label)) . '</span></' . $label_element . '>';
  }
  $element['#suffix'] = '</' . $html_element . '>';
}