The last firmware update for the PS3, version 4.10, added an audio option allowing players to hear their own voice echoed through the new Wireless Stereo Headset
peripheral. Since implementing the feature, Sony has heard some complaints; this new firmware update, version 4.20, will add new audio options.
If you're using a Wireless Stereo Headset, you will be able to either turn the functionality completely off, or you can select from one of five different levels of intensity, the PlayStation Blog
says. Sony will also add an option for virtual surround sound when using the Wireless Stereo Headset to watch Blu-ray or DVD movies when the update drops tomorrow.
Other non-audio additions include more flexibility when setting how long before the system will shut itself down, and an the option to manage save files in bulk.