Wordpress 4.4.1
PikList 0.9.4.29
The description for a text field inside a group is not appearing within the edit post view. Here is the code for the meta-box. I am also attaching an image of the result within the edit view, and the html for the group field.

/*
Title: Text Field Test
Description: Text Field Test
Post Type: post
*/

piklist('field', array(
  'type'    => 'text',
  'field'   => 'text_field_alone',
  'label'   => __('text_field_alone'),
  'description' => __('description for text_field_alone'),
));
piklist('field', array(
  'type'    => 'group',
  'field'   => 'group_with_text_field',
  'label'   => 'group_with_text_field',
  'description' => __('description for group_with_text_field'),
  'fields'  => array(
    array(
      'type'    => 'text',
      'field'   => 'text_field_in_group',
      'label'   => __('text_field_in_group'),
      'description' => __('description for text_field_in_group'),
      'columns' => 12
    )
  )
));