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Now running Windows Mobile 6.5 (like the recently announced HTC Touch2), the Xperia X2 is a followup to Sony Ericsson's original Xperia X1, released last year. Like the Xperia X1, the X2 (right) features both a touchscreen and a slide-out, "wide pitch" QWERTY keyboard, plus Sony Ericsson's "Xperia panels" user interface (see later in this story for details).
While the X1 already featured a touchscreen with a resolution of 800 x 400 pixels, the X2 gets a camera that has been upgraded from the former 3.2 megapixels to a whopping 8.1 megapixels. Other key additions are an accelerometer and TV output, according to Sony, but the FM receiver that came with the X1 is no longer listed.
As was the case when Sony Ericsson launched the X1, the company has provided no information about the X2's processor, RAM, or flash storage, except to cite "110MB of phone memory." According to the SE-First.com website, however, the X2 uses the same processor as the X1 -- namely, Qualcomm's MSM7200 clocked at 528MHz. Storage, meanwhile, is expandable by up to 16GB using a microSDHC-compatible expansion slot, says Sony Ericsson.

Connectivity includes quad-band GSM (850, 900, 1800, 1900MHz) and five-band UMTS (850, 900, 1700, 1900, 2100MHz), with Enhanced Data Rates for GSM Evolution (EDGE), High-Speed Downlink Packet Access (HSDPA) and HSUPA (High-Speed Uplink Packet Access). The phone also includes Bluetooth, WiFi, and GPS interfaces.
Xperia panels
A feature carried over and enhanced from the X1 is Sony Ericsson's Xperia panels feature, described by the company as "Windows Mobile applications that extend the Today Screen API [application programming interface] in order to provide a full-screen immersive experience." The finger-operable panels can be arranged by a phone's user at will: On the X1, as many as nine of them could be placed on screen simultaneously, allowing their contents to be viewed via live thumbnails.

Features and specifications listed by Sony Ericsson for the Xperia X1 include:
According to Sony Ericsson, the Xperia X2 will be available early in the fourth quarter of this year; pricing was not released.
For further information on the Xperia X2, see the Sony Ericsson website, here. For further information on the Sony Ericsson Panel SDK for X2, see here.
For the SE-First.com article mentioned earlier in this story, see here.