Well, look what we have here. It appears an observant shopper got in touch with Android Central this morning with a link to a piece of evidence that is so random it must be real.
A British online phone store called phones4u (shudder) put up some product images for its Xperia T page. What it didn't notice, apparently, was that at least one of the images Sony sent along was for the wrong phone. It's still an Xperia T, but "oops" is probably the best way to describe this leak:
Now, look carefully. Yeah, that's an AT&T logo on the front.