woothemes/woocommerce — pull request #829 by rabhw (2012-03-16 19:23:48+00:00)
Title: Added class for available on backorder.

This will help in cases where the user wants to hide the # of items in stock, but still wants to show when an item is out of stock, or on backorder.

Currently there is no way of differentiating in CSS between an in-stock item, and an item that is out of stock but available on backorder.