Just did a bit more browsing around, apparently this phone is released in Japan as the HTC Dual Diamond (S22HT). The HTC Diamond is also known as the S21HT over there.
And they've got a white cased version (what they call "White Pearl"). Have a look here.
Also, this Japanese version runs on HSDPA/W-CDMA 1700/2100MHz. And no, I can't read Japanese either.
I am not convinced on the white