In a PlayStation.com Forums thread about the existing Uncharted 2 chat system, a Naughty Dog staffer with the handle "ReklissAbandon" reportedly said that "the next PS3 firmware update is going to allow cross game chat."
Currently, that alleged confirmation is "deleted" (presumably by ReklissAbandon), but the text reappears as a quote a couple of posts down the thread. We've got the full quote after the break in case all record of the statement should meet with an unfortunate accident, and we've also reached out to Sony for comment. In the meantime, please temper your excitement over hearing your friends' voices with a bit of healthy skepticism.
[Thanks to everyone who sent this in!]
Reported statement made by ReklissAbandon:
"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."