Maybe the iOS multitask pane is due for a bit of an update. It’s been a long time since Apple introduced it, and the iPhone is probably capable of a bit more at this point.
Look at the above video. It shows a multitask window with a full app preview. Developed by Jesse Head, it features a new way to do multitasking. It’s a great concept if it can be properly pulled off without sucking too much battery life or slowing things down.
Apple is due to release iOS 7 this year, as well as the iPhone 5S, so long as it keeps up the yearly schedule. Perhaps app switching will change a little.