A minor update is in the wild. Sadly, not Lollipop.
Version - Release Date
Description of Enhancements/Fixes
L720TVPUBOA3 02/04/2015
** Wi-Fi Calling Enhancements
Find and update the software version on your Samsung Galaxy S 4
Version - Release Date
Description of Enhancements/Fixes
L720TVPUBOA3 02/04/2015
** Wi-Fi Calling Enhancements
Find and update the software version on your Samsung Galaxy S 4