WPSauce have been sent this screen shot of the Samsung Omnia 7 supposedly running Windows Phone 7.5 7720, which is the Release to Manufacturer version of Mango.
The development is either evidence of the OS being hacked into the handset, or of the OS undergoing carrier testing.
I am sure the impatient few would prefer the former, while I am sure most of us just wish the official update would come sooner rather than later.
Read more at WPSauce here.