Android 2.1 became officially available for Sony Ericsson Xperia X10 six weeks ago. Rollout of the new OS has been done in steps depending on market and operator.
Another update was released yesterday. It is for the entire Xperia family of phones. X8, X10 Mini, X10 Mini Pro and Xperia X10. Sony Ericsson is comitted to improve the software for up til 2 years after launch. So we have one year left with updates for the X10
This update is minor and the firmware version is still the same: 2.1-update1. You will need to use SEUS (Sony Ericsson Update Service) application from a PC. It is not available over the air (OTA) yet so your phone will still report that you are having the lateste update even though you don’t.
According to user reports the update will change In-call volume, give a keyboard facelift, Mediascape and Timescape is a little faster and probably some more changes. You will not be able to root the X10 with currently known tools after the update.