The good news for all the lucky Galaxy S4 consumers on Sprint will be on the receiving end of its first OTA (Over The Air) update as of today.
The over-the-air update is about 24 MB in size while bumping up the software version to build L720VPUAMDL . It is rather unfortunate that there is no changelog available for this particular update.
So it is safe to assume that this particular update is a last minute patch for the smartphone’s software.
A notification of the software update will pop up on your smartphones but in any case you missed the notification of the software update on your Galaxy S4, you can always attempt a manual update by going to Settings > More > System Update.