Final Rumors : A bunch of leaked images has surfaced on a Chinese forum, revealing a Samsung Android smartphone with two SIM card slots, a 1080p screen, 2 gigs of RAM, 13 MP camera, an 1.8 GHz clocked processor and Android 4.2.1 on board.
The smartphone goes by the name of GT-I9502, which suggests it's the dual-SIM version of the Galaxy S IV for China Unicom. If that turns out true this could be the design of Samsung's next flagship device. Also the dotted underlayer of the back panel resembles that of the invite Samsung sent for its upcoming Galaxy S IV announcement, which adds credibility to these leaked images.
However, given how good Samsung was in keeping the design of its recent flagships, this could also be simply a holster for testing purposes. The practice of using generic prototype shells in order to protect the final design was used by Samsung with both the Galaxy S III and the Galaxy Note II. That way when the phone is sent to carriers and other companies the design couldn't be leaked.