Android 4.4.3 now rolling out to Samsung Galaxy S4 Google Play edition
As we know by now, the update is mostly under-the-hood improvements to security, stability, power profiles, and general bug fixes. The one outward-facing update is a refresh to the Dialer app UI. The change log hasn't been released, so we don't know if there are any hardware specific fixes for the Galaxy S4 GPe.
We have also seen indications that Samsung is testing the Android 4.4.3 update for the Galaxy S5 and the Galaxy S4 LTE-A, but there has been no word on when to expect those updates.