Immediately following news that Windows Phone 7.5 “Mango” has been released to manufacturers, Toshiba-Fujitsu became the first vendor in the world to announce a Mango phone. The stylish smartphone will launch with a less-than-memorable IS12T moniker in September, and it will be a KDDI exclusive in Japan at that time. Beyond being the first Mango phone announced, the IS12T will also be the first Windows Phone-powered smartphone to launch in Japan. Spec highlights include a 3.7-inch WVGA display, a 1GHz Snapdragon processor, 32GB of storage and a 13.2-megapixel camera. Toshiba-Fujitsu’s announcement is the first in what we hope will be a long line of new smartphone announcements from Microsoft’s Windows Phone partners. New devices are expected later this year from vendors including Samsung, HTC, Dell and of course Nokia.