Just read this on the US PS3 forum
Hes now deleted the post
Wonder if its true?
"I think they wanted people to have fun and ejoy the show since all dead players can talk to each other no matter what team you are on. But I will suggest it anyway. Not to mention that the next PS3 firmware update is going to allow cross game chat. So if players use that instead of in game communication then they would also be able to communicate enemies positions." Posted by ReklissAbandon, a Naughty Dog Dev
Hes now deleted the post

Wonder if its true?