Take a gander at the mystery device in the video above (whilst being soothed by the dulcet tones of Underworld's “Jumbo.”). Although the video seems to use some PSP-Esque graphics, this is definitely a communication device that the big SE has up its sleeve. It's new to us, at any rate.

We bring it up because during our Q&A about the Sony Ericsson Xperia X1, the execs were pretty adamant that “Xperia” is going to refer to an entire line of devices -- which is why the first is called the “X1.” It sure doesn't seem to fit well into any of SE's other other device brands. Now, it's not even certain that the above promo is for an Xperia device, or that said device will run of top of Windows Mobile, nor even that everybody else but us knows exactly that this mamma jamma is and we're posting here with Sony-flavored egg on our face.

In any case, we threw some grabs from the video after the break. Anybody care to enlighten us?