A day after promising it would release it next week, Sony Ericsson Canada today announced via Facebook and Twitter that the Android 2.3 upgrade for the Xperia X10 is now available:
Great news – The #Android 2.3 upgrade for the #Xperia #X10 is ready to go. Update now via PC Companion.
As the tweet indicates, you will need the Sony Ericsson PC Companion 2.0 software to do the upgrade.