This has just been announced at Barcelona and Engadget has got some shots of the XPERIA X1, which will feature US 3G support. The design is attractive, and will be the first time that Sony Ericsson will license Windows Mobile.

Sony Ericsson has traditionally used the UIQ operating system, which runs on top of Symbian OS, on its high-end PDA phones.

The device will feature a unique arc-sliding keyboard, WVGA screen, and GPS. It is expected to ship in select markets in the second half of 2008. A live picture of the device can be found here.

This looks like a great handset. Sony Ericsson has traditional designed some great phones.

Complete specs as reported by Engadget:

Camera

-Auto focus

-3.2 megapixel camera

-Photo light

-Video recording

Music

-Bluetooth™ stereo (A2DP)

-Media player

-Music tones

-PlayNow™

-Windows Media Player Mobile

-3D games

-FM radio

-Java

-Video streaming

-Video viewing

Internet

-Internet Explorer® Mobile

-RSS feeds

Communication and Messaging

-Polyphonic ringtones

-Speakerphone

-Vibrating alert

-Video calling

-Email

-Picture messaging (MMS)

-Predictive text input

-Text messaging (SMS)

Design

-XPERIA™ panels

-Optical joystick navigation

-Navigation key

-Picture wallpaper

-Touch navigation

Organiser

-Alarm clock

-Calculator

-Calendar

-Document editors

-Document readers

-Flight mode

-Handwriting recognition

-Notes

-Phone book

-Tasks

-Touchscreen

Connectivity

-aGPS

-Bluetooth™ technology

-Modem

-Synchronization

-USB support

-WLAN

Windows® Mobile® Operating System

-Microsoft® Outlook Mobile: email, contacts, calendar, tasks

-Microsoft® Office Mobile: Word, Excel, PowerPoint

-Internet Explorer® Mobile

-Windows Media™ Player Mobile

-Windows Live™

-Exchange ActiveSync®

-Voice control

-Utility Applications: file explorer, calculator, pictures & video, notes

Facts and Figures

-Size: 110 x 53 x 16.7 mm

-Weight: 145 grams

Available colours

-Black

-Silver

-Main screen: 65,536 color TFT

-Resolution: 800 X 480 pixels

-Size: 3 inches

Memory

-Phone memory: up to 400 MB

-microSD™ memory card support

-Availability and versions

Networks

-GSM/GPRS/EDGE 850/900/1800/1900

-UMTS/HSDPA/HSUPA 900/1700/1900/2100 MHz

-UMTS/HSDPA/HSUPA 850/1700/1900/2100 MHz