Fujitsu Toshiba Mobile Communications on Tuesday announced what it says will be the first handset based on Windows Phone "Mango," the next generation Windows Phone OS that Microsoft finalized this week. And in keeping with the next generation theme, this device, the IS12T, is a monster, with a dual core processor, a 13.2 megapixel camera, 512 MB of RAM, 32 GB of internal storage, and a waterproof design.

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Fujitsu Toshiba says the IS12T will ship in "September or beyond," in Japan, and if this is truly the first shipping Mango device, it's safe to assume that other devices will begin appearing other markets, including the US, later that month or in the months following.

The device appears to be based on the Fujitsu Regza T-01C, an Android-based handset with nearly identical specs. It features a 3.7-inch LED screen, a 1 GHz Qualcomm processor, dual radios with both CDMA and GSM support, GPS, six-axis motion sensing, Wi-Fi B/G/N, and Bluetooth. The case is waterproof and dust resistant, and there is a micro-USB expansion port.

The IS12T will ship in multiple colors too, including yellow, pink, and black. However, it will only be made available in Japan.