Japanese spare parts retailer, Moumantai, has listed what it claims is the genuine back panel part for the Sony D6503 ‘Sirius’, which it is listing as the Xperia Z2. The part matches up with what we have seen previously in leaked pictures. Moumantai says that double-sided tape is included on the back cover and lists the part for 4,000 Yen (c$40), although you cannot order it just yet. All of this surely points to an imminent announcement of the handset at MWC 2014.
Sony D6503 Sirius rear panel part
Leaked picture of Sony D6503 Sirius showing rear
Via Blog of Mobile.