Benchmarking site reveals a 4.7-inch mid-range Windows phone
The mystery phone is listed as Quanta MTP8952
An unreleased Windows phone has been listed on the GFXBench website on October 14th. Codenamed Quanta MTP8952, the phone could be one of the upcoming models by ODM partners or by Microsoft itself. Of course, there is no guarantee that MTP8952 will be ever released, as it could be one of the prototypes in testing.
If the new listing is to be believed, Quanta MTP8952 will be a decent mid-range device with a 4.7-inch Full HD display, an octa-core Snapdragon 615 processor, Adreno 405, 2 GB of RAM, and 16 Gigs of storage.