According to Sammyhub, A well known Chinese forum has published some leaked pictures of the so called Samsung Galaxy S4 (GT-I9502). We have images here that revealed the design. We are pretty sure that this device isn't a photoshopped but could just be another prototype Samsung may have been testing. As Samsung did a similar thing with the Galaxy S III.
This prototype looks more like the Galaxy Note II and if we consider the legitimacy of the leaked cases that hinted on a squarish-design, keep in mind that this may not be the final Galaxy S IV.
However, the underlying hardware shown in Antutu test tells a different story. According to the benchmark app, the device runs Android 4.2.1 and boasts a 1080p full HD display along with 1.8GHz processor, 2GB RAM and 13MP camera, which could more or less be the final hardware found on the Galaxy S IV.
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Source: chinese forum / sammyhub