Update: The official PlayStation Site was recently revamped, and now lists in-game chat for online games as a separate feature and states, to quote:
"Talking with friends or other players in the middle of a game is easy. Chat by text or use your headset to voice chat. You can also add new friends or check other player's profiles (including their Trophy collections) to know who you're up against while you're playing."
Although many are a bit disappointed that yesterday's PS3 Firmware 3.10 update announcement didn't include the cross-game voice chat functionality discussed recently by PSN Director Eric Lempel, it is in the works.
The European Blog's James Thorpe has revealed that cross-game voice chat is coming in response to the question "when is there going to be cross-game voice chat?" regarding the firmware update.
To quote his reply: "I wish I could just give you a date, I really do!"
"Trust me when I say that as soon as I hear from 'up top' I will be shouting about it and making myself the most popular person on the blog."
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