The tapping on the status bar has been around in iOS for a long time and works across most apps basically. Not quite sure about tapping the bottom icons really doing much in the way of scrolling.
Yeah I think most people knew about the status bar one, that's why I said it's been around for several versions.
What is there to be unsure about? It works exactly like the status bar but in the opposite direction. Tap on Photos, scroll to middle, tap Photos icon, it scrolls to the bottom. If your in albums, go to your camera roll, scroll to middle, tap Album, it scrolls to bottom. I didn't think this needed this much explanation.