comment body size in hook_form_comment_form_alter What is the correct syntax to alter the size of the comment form body text area?  I can't for the life of me find it in devel dpm.

$form['comment_body']....something....
You can use the #rows and #cols properties to define the height and width respectively:

$form['comment_body'][LANGUAGE_NONE][0]['#rows'] = 10;
$form['comment_body'][LANGUAGE_NONE][0]['#cols'] = 50;