According to reports, God of War III is set to feature an online cooperative mode. Some guy claims to verify this as he has access to the Sony retail loyalty site and seen it mentioned there.
<blockquote>You read it right! God of War III will feature online cooperative modes. There have been rumors flying across the web regarding cooperative modes for God of War III, but I am here to confirm it to all. March 2010 just cannot come soon enough!</blockquote>
News Source: <a href="http://thegameraccess.com/ps3/official-god-of-war-iii-will-have-online-cooperative-modes" target="_blank">Thegameraccess</a>