While the information on a possible upgrade to Windows Phone 8 for the current devices are scarce, it seems that Nokia has started pre-installing Windows Phone Tango on Lumia smartphones.
As was reported by WPCentral one of there tippers send his smartphone for repair, a Lumia 710 with Roger (Canada) and received replacement device with pre-installed WP7 OS Build 8773. The firmware is, as we know, the new version of Windows Phone, or Tango / Mango Refresh.
Is this a sign that the official Tango release is really very close?
