File this one under "curious", but it looks like Japanese carrier KDDI may be not only getting their first Windows Phone this August, but it'll be the first phone with "Mango" on board. The phone itself is a Toshiba-Fujitsu IS12T (catchy name!) which sports a 3.7" LCD screen and a water-resistant case. In fact, it looks to be the same phone first shown a few days ago at WPC11 by Microsoft.
The device also has FCC & Bluetooth clearance, which could mean a U.S. release at some point, but seeing a Fujitsu has little presence here, we're not too confident on that one.
Regarding that "first phone with Mango" bit, we would be a bit cautious on that as the OS hasn't gone gold yet and there are no firm dates yet for any release, let alone hardware. Microsoft for certain has projected "windows for release" but we would be surprised to see this actually happen by August. Then again, it could validate the whole Mango-in-September tweet from a few days ago, so who knows.