A new PlayStation 3 firmware update is scheduled to release tomorrow, Sony’s confirmed.

Software update 4.20 will bring along various new features which includes time-off adjustments, the ability to copy multiple items of save data and tweaks to the system’s wireless stereo headset option.

Posted below is the full rumoured list of updates from GAF:

Wireless Stereo Headset

When the wireless stereo headset (CECHYA-0080) is connected, you can now adjust the sidetone level for microphone audio. Select [Sidetone] under (Settings) > (Accessory Settings) > [Audio Device Settings].

Off: Disable microphone audio from the headset

1-5: Enable microphone audio from the headset

Auto Off

You can now set the amount of time until the system automatically turns off. Under (Settings) > (Power Save Settings) > [System Auto-Off] you will be able amend the time for [Video/TV/Music/Photo] and for [Game/Other Features]:

Video/TV/Music/Photo – After 1 Hour, After 2 Hours, After 3 Hours, After 4 Hours, After 5 Hours, Off

Game/Other Features – After 1 Hour, After 2 Hours, After 3 Hours, After 4 Hours, After 5 Hours, Off

If you enabled [System Auto-Off] in system software prior to version 4.20, the selected time will be set for both [Video/TV/Music/Photo] and [Game/Other Features].

The default settings are [After 4 Hours] for [Video/TV/Music/Photo] and [After 1 Hour] for [Game/Other Features].

Save Game Selection

Under (Games) > (Saved Data Utility (PS3™), you can now select multiple saved data items, and then either delete or copy them as a group.

You cannot use [Copy Multiple] to select data that is copy-protected.

Some saved data cannot be copied.

The upper right corner of the screen displays: the number of saved data items that are selected, the total number of saved data items and the total file size of the saved data items that are selected.

We’ll keep you posted about any other features which the update may include that isn’t included in this list.