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Sony have begun rolling out the Android 4.0Ice Cream Sandwichupdate for the Sony Ericsson Xperia Arc globally. Included in that roll-out is the Pearl Blue version (1246–2425) from Optus — the update was officially pushed out last Monday according to Sony, so you should be seeing it soon.

To download and install the update you’ll need to download the Sony PC Companion tool (or Bridge for Mac) and plug your Xperia Arc into your computer to begin the update process. Let us know if the update is ready for your device.

Source: Sony Mobile (Forums).
Companies: Optus, and Sony
Devices: Xperia Arc