An official headset for trash-talking during online play on PS3 is in the pipeline, but before it arrives Sony has told CVG that you'll be able to configure Blutooth mobile phone headsets to work with PS3 in much the same way.
In the PS3 firmware is a Blutooth Settings menu where, as on-screen text explains, you will be able to configure link-ups with headsets, microphones and headphones that are Blutooth compatible.
This means that instead of waiting for official peripherals, you can get your PS3 talking online, among other things, using products already available.
It is not yet known when official Sony headsets will arrive, but we'd expect not too long after US launch.