The Fujitsu-Toshiba IS12T is the first device announced running Windows Phone 7 Mango. It is waterproof and features an earthquake warning system. The IS12T also features a 3.7 inch display, has a 13.2 MP camera, 32 GB of internal storage and is powered by a Qualcomm MSM8655 processor.
The device will be made available today in Japan through KDDI and Okinawa Cellular Telephone Company in three colors - Citrus, Magenta and Black. At this point there is no information on international availability.
