The W900i is the commercial designation for the Sakura/Ophira family of devices, leaked here and a few other locations:
It's an UMTS version of the S700, and looks somewhat like the W31 created for Au in Japan.
Notes:
Pluses:
- Excellent Bluetooth support.
- Big, very readable screen.
- Browser with content zooming.
- Very good 2Mpixel camera, able to record very long, relatively high quality 3GPP videos
- Charges off USB adaptor cable.
Minuses:
- Absolutely idiotic SonyEricsson proprietary connector (with USB adaptor)
- Big, chunky, heavy.
- Unwieldy and hard to use with one hand.