HTC Touch Diamond followed by the HTC Touch Pro; HTC Touch HD followed by the HTC Touch HD Pro? Could be.

The mockup here shows what the device could look like—the same HTC Touch HD we’ve all know and love, maybe, with a QWERTY keyboard tacked on.

Again, this rumor mainly came about because of the “Device, Device Pro” progression we’ve seen for other HTC products. That is to say it’s tenuous at best.