Italian website newsMobile seems to got some further information about HTC's to be announced HTC Touch Diamond and following T-Mobile's first show-off at this years CeBIT and the later grainy photo of HTC's new smartphones, this seems to be legit information.
According to newsMobile, the HTC Touch Diamond (official name still to be confirmed) will features Windows Mobile 6.1 Professional, quadband GSM/GPRS/EDGE/UMTS/HSDPA/HSUPA (while it's not yet clear if it might be triband GSM/GPRS/EDGE and singleband UMTS/HSDPA/HSUPA), Bluetooth 2.0, WiFi b/g, eGPS, FM radio and a 2.8" VGA (640x480 pixel) touchscreen:

Furthermore, the Touch Diamond is expected to be powered by a Qualcomm MSM7201A CPU at 528 MHz, and featuring 4 GB internal flash. While microSD is mentioned as well, sources said the HTC Touch Diamond will lacks microSD expansion.
Last but not least, the device features a 3.2 megapixel autofocus camera on the back and a second VGA cam on the front and the Touch Diamond is also expected to feature an orientation sensor/accelerometer which rotates the screen automatically.

It's not yet confirmed that the specs or the rendering above are legit but there are no doubts that this is the mysterious HTC Touch Diamond which is expected to be announced next Tuesday. In any case, that's an impressive feature-set for a Windows Mobile device.

Cheers ~ Arne

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From the 'leaked' images it seems that it has both 'home' and 'back' keys more commonly associated with WM Standard. The Diamond might be Standard instead of Pro...?

That's true and I wrote about this "weird" button layout before when the T-Mobile  MDA compact IV photo hit the net the first time.
However, if it would be a Standard smartphone it would need a hardware keyboard which is not on the photos above and furthermore, trustworthy sources confirmed that it will be a Professional (aka Pocket PC Phone Edition) smartphone.
Well, I'm sure we will know more tomorrow at the same time...