woothemes/woocommerce — pull request #3565 by jasonknight (2013-08-01 13:47:37+00:00)
Title: Allow filtering of shop_order order_itemmeta for plugins

Plugins that may work with custom order_item meta fields might want/need to change the edit appearance on the shop_order cpt. I have added a simple filter with two arguments (The current text, the $meta array) that can facilitate this.