As expected, HTC has started pushing the Android 2.3.3 update for Desire Z in Germany and Australia. Update is available over the air, so you will get a notification on your Desire Z to download and update the device.
The FOTA release of Android 2.3.3 ‘Gingerbread’ will be rolled out slowly to all HTC Desire Z. So don’t panic if you don’t receive any notification right now.
Update: It seems French users have started getting the update as well. [Thanks G123K]