Android Jelly Bean 4.3 For Galaxy S4 Google Edition (GT-I9505G) leaked and ported to Galaxy S4 (GT-I9505)
Today a surprise came for all developers and owners of Galaxy S4 Snapdragon Edition (GT-I9505). The full dump of system (from Google Edition of SGS3 - GT-I9505G) for Google Android Jelly Bean 4.2.2 is spreading over the forums and various ports are already made by XDA-Developers members.
Additionally, the Sammobile website managed to get their hands on early Android Jelly Bean 4.3 build for Galaxy S4 Google Edition and released it to the public, with the fully functional port for Galaxy S4 Snapdragon Version (GT-I9505)
And follow the xda-developers threads or Sammobile link to upgrade your GT-I9505 to Jelly Bean 4.3