A Mobile-review review is always eagerly awaited, as they tend to be pretty detailed with lots of useful opinion. This preview is not that yet, but does contain plenty of screen shots and comparisons with other devices.
Some items of note is that they mention the Xperia X2 has loud stereo speakers, correcting one of the X1â€™s failings, and the keyboard is very good, correcting another.
They also however confirm the disappointing presence of a Qualcomm MSM 7200A processor running at 528 MHz.
Read the full preview here (translated from Russian).