I found this fascinating quote today:
I would like to tell those people who have been eagerly waiting the launch of the Xperia X2, i.e. Sony Ericsson’s XPERIA X1’ssuccessor that the company has announced that they will declare about the launch of the Sony Ericsson Xperia X2 next week. Just keep patience! The Xperia X2 codenamed as Vulcan will carry some of the features of its predecessor but with a difference.dashingmobile.com, Dashing Mobile, Aug 2009
You should read the whole article.