Before the update, the back button would go back a page in an app. If you were at the first page of the app it would back out of the app and return you to the screen that the app was located on. The home button would back out of the app immediatly and leave it on whatever you were looking at last; it would back out to whatever screen you were on last. For example, if you were looking at screen 4 of 5, it would back out of the app to that screen.
After the update, the back button works the same as above. The home button backs out of the open app in the same way as above and then goes to the home screen. By home screen, I mean the 3rd of the 5 screens. This happens when I'm using an app that is not on that 3rd page. Does what I'm saying make sense?