There was a post somewhere recently talking about that, I believe either the last (as in, after every possible time extension) 5 or 15 minutes of the match, the Orks would have instant respawn and a small percentage of damage mitigation (15%?) on top of their loadout attributes. EDIT: Read the below post.
http://forum.eternalcrusade.com/threads/patch-22-sep-8.56582/ Bout 'alfway down dere, you'll see where 'ooman tells ya wot it does.
