Some ealier today, on a Slovakian Facebook page, an individual supposedly was selling an HTC HD7 with "Tango" Windows Phone out of the box. Per Facebook page translation:
HTC HD7 16GB (T9292 Schubert) for sale. You can select from three builds of Windows Phone - 7.0.7392, 7.10.7720 (Mango), 7.10.8200 ("Tango"). The first two are stable and functional build, third is dev build (not stable and to continue with official builds you have to flash it using RUUs). Price starts at 150€, you can contact me on my mail which I have on the forums, only through mail, highest price wins, delivery is not included in the price (only express delivery, not post office). In mail, write down which version of the OS you want, RUUs are not included. All accessories, slovak distribution, arrived today 🙂
Here's the picture of the device from Facebook:
It makes sense that the Tango update would be primarily minor, given that the following Windows Phone update, dubbed 'Apollo', is being designed for the next series of Windows Phone, potentially opening the door for it to be called Windows Phone 8.
After a Tango build was spotted last week in server logs, it's expected that the update will improve the phone's search functionality to include content physically on the device, and voice activated search.