If you own a LG G3 or LG G Flex on Sprint then you will receive an over-the-air update soon, though I would advise you against getting your hopes up if you’re waiting for Android 5.0 Lollipop. The incremental update that Sprint is pushing out for these handsets is going to bring international Wi-Fi calling. You will have to wait for some time if Android 5.0 Lollipop is the update you’re more interested in at this point in time.
Official documents from Sprint show that the LG G Flex will receive an over-the-air update which will include international Wi-Fi calling, enhancements to HD Voice, as well as crucial security patches from Google.
Apart from all this, the OTA update for LG G3 also brings a security patch from Qualcomm, improved unlock algorithm when phone is in the pocket, enhancements to LG home, the compass app and auxiliary cable recognition.
These incremental updates will ensure that user experience across both devices is improved, apart from the fact that both devices will be much safer as a result of Google security patches which are included in the updates.
Sprint has updated support pages of LG G3 and G Flex to reflect these over-the-air updates. The roll out should begin shortly and will cover everyone within the next few days.