Hey what do you guys think of this type of notifications, it could show up when you double click the home button, then if you swipe to the left it could have more settings to easily turn on/off.
It could hover a transparent image at the top of the screen for a second, or just have a number icon on the top bar to let you know you have notifications waiting for you.
I made something similar to this a while ago... It looks a bit ugly though. A lot of wasted space. I'm sure Apple could figure out a better way to do it than you or I.