Samsung Galaxy S4 Google Play Edition is getting an update to Lollipop 5.0. The first GPE phone is finally getting its update –well ahead of other more recent flagships as is – and you can update it manually or wait for the rollout to reach you (if it hasn’t already).
The build you are getting is 5.0 not 5.0.1, which means you may get some bugs with it too, at least until the next OTA hits. Even if the device is getting rather old – in relation to other devices – it may still get support from Google.
The Lollipop update is 500 MB, so you’d better wait for some WiFi connection to download it, unless you want to wreak havoc to your data plan.