Sprint is now pushing an update for both the Samsung Galaxy Note 4 and the Galaxy S5 which brings a single change, "Reactivation Lock updates." Sadly, that is the only change listed by Sprint. This doesn't mean that there are no other tweaks, or enhancements that come along with it, but all they are advertising for the update is around the Reactivation Lock.
Either way, if you own either device on Sprint, you should see the update hitting your device shortly. The Galaxy Note 4 will land on version N910PVPU3BOF5 after the update, while the Galaxy S5 will be on G900PVPU3BOF6. If you have already received the update, be sure to let us know if you notice any other changes.