Yes, it's an S5. I bought it over 2 years ago. It has the latest applicable update from sometime around the end of February. And this lock screen is not always on. It only appears when I plug in the charger or unplug the phone from the charger. When it comes on, there is a slide to unlock message at the bottom and when I slide, my pin pad unlock screen appears and this new screen doesn't appear again until I plug or unplug it. It cycles through a slide show of scenes, pictures that are not on my phone. It also says Good Morning (or Afternoon, or Evening depending on the time of day). It also displays the temperature, battery level, and I can scroll up to get a transparent view of the weather forecast shown over the changing scenes. If my ringer is on mute, i.e. vibrate only, there is a message that I might miss a call. It provides a selection of "That's OK" or "I don't want to miss a call". If I select that I don't want to miss a call, it sets the ringer to full volume.
I'm going to a Verizon store tomorrow to see if they can figure this out. It's not unpleasant if it's not some sort of malware. It also has appeared on my wife's S5 for a while, but seems to have gone away and is not affecting hers anymore, but we didn't do anything to make it go away.
