It will in fact be the HTC Victor, which a smooth backed version of the Diamond. Also it will sport a Blue and White version of TouchFlo3D

Both O2 and T-Mobile will be shipping the Victor. O2 will be releasing it as the O2 XDA Diamond and T-mobile's version will be called the MDA Compact IV. T-Mobile are also releasing the MDA Vario IV, which is a Victor equvalent of the Touch Pro. Both devices have rounded corners and drop the diamond...

The HTC Touch Diamond is apparently now available with a more plain, less stylized look. Code named the HTC Victor, this version of the Touch Diamond looks very much like the customized version being launched by Telus, a Canadian CDMA carrier. See this report from MOBILEBURN.COM along with pictures.