looks like DHD gonna release on or so by 18th oct. I email T-mobile UK customer service and they reply me this:
"Thanks for your email Inn, asking me when the HTC Desire HD will be released with us along with the tariff details.
I can understand how important it's for you to know when this phone will be released and writing into me regarding this.
Inn, I'd like to tell you that the HTC Desire HD will be released on or around 18 October. However, I wouldn't be able to assure you the exact date when it will be released."