First of all...potential God of War III spoilers alert. PSM3 reported back in April that a "trusted source" had suggested God of War IV would drop in September 2012. Now, the January issue of the mag is declaring that co-op may well be on the way too.
It's suggested that online co-op will be a part of the new game, with players choosing between Kratos and his dead brother Deimos.
"Why is it hot? It’s bringing double Kratos to the series. GOW4 was confirmed to PSM3 mid-2011 by a reliable source, and rumours point to a multiplayer twist. Mad idea? Online co-op with a (possibly) dead Kratos and (very) dead brother Deimos teaming up to escape the afterlife."