Commit re-factors post-form.php for markup layout, comment out closing divs, add id's for js hooks, move new tokens to classes to provide the semantic styling hooks, revert teaxtarea control name to kick form posting into action. Change 'whats new' text to a label element to support the textarea & moving label and text elements under the parent 'whats-new-textarea' /'update-textarea'.

Uncomment get_template post-form in single/activity.php to bring post form into play.