I know that setting $t = get_t() is common in hook_requirements, but I've never seen a double-dollar sign in front of $t before. This looks accidental.
Diff between the 1.0 version and the 1.1 version:
$requirements['plupload'] = array( - 'title' => t('Plupload library'), - 'value' => t('Unknown'), + 'title' => $$t('Plupload library'), + 'value' => $$t('Unknown'), );
Is this double dollar sign intentional?