Along with Predictive Text no longer working surprise, I thought this was/still is rather annoying. As I recall with the stock ICS, pressing the home button after the phone times out, the screen wakes up to the last opened app. Now, hitting the home button, it closes the last app and gives you the home screen right away. So in order to return to the last app screen, I have to wake it up by pressing the power switch. I don't know if this is the way Jelly Bean works or is that another quirk.