
Samsung chose for the full polycarbonate version with corners of metal and Super AMOLED display which has a sort of Pentile structure!
Samsung dropped the version of plastic with the corners of metal / aluminium and PHOLED display with RGB structure!
There was also a full metal version but this version couldn't make trough the first round. Which directly hints to that Samsung completly ISN'T ready to build full metal devices. Which is sad for a lot of people. According to our insider the Galaxy S 4 is easy to build like the way Samsung chose to do so. The premium feeling is totally gone because of the missing metal / aluminium materials.