"Multitasking" on iOS with a WManager

With this windows manager (http://www.youtube.com/watch?v=7cYWha8YFi8) iOS on Apple Ipad kicks ass.
You can transform your fullscreen app in a sizable and movable windows for true efficiency.
It's called Quasar.

Pro:
- Fluid
- Good UI
- This is a killer app

Cons?
- It costs 9,99 $
- It's only for jailbroken devices

Ok, it's a "hack", a custom tweak, but iOS with that feature blows away the other mobile operating systems.
Just think about Windows 8 carrying a dual tasking (snapping apps) not only in tablets, but also in desktops.
Android with the "app bar" (like the app bar in W8, the left bar that contains all opened apps) offers a quick way to switch and show apps, but it's not a windows manager.

How long will take Apple to implement this natively?
And the Android developers?
And the Windows Developer Team... oh wait, we already know :facepalm: