There has been a lot of speculation on the Internet about when this device would be available but Sony Ericsson have now confirmed that the device will launch Sept 30th in UK, Germany and Sweden!
To start the countdown to the launch of Xperia™ X1, Sony Ericsson will host a live global webcast on September 15 at 13:00 GMT + 1, offering viewers the first in-depth demonstration of the handset. The web cast will also premiere the first episode of an alternative reality thriller Johnny X. To register to view the web cast and Q&A session with Xperia™ X1 Senior Product Manager Magnus J Andersson, So mark your calendar and head over to HERE to see the webcast
You can get more details about this device and the announcement in the Press Release
Alternatively check out the X1 Website