Concept Image: Jacob Rendina
iOS met its biggest redesign with iOS 7, Apple switched from skeuomorphism to a Flat Material UI, but, with a serious redesign expected in iOS 13, we expect more than just a visual change.
Skeuomorphism is a design principle that makes something new look like something old and familiar. It has multiple layers with shadows giving you a better interaction with a device.
This was the trend with iOS when it was originally designed by Scott Forstall and has been for around 6 iterations. Though the material/flat design is more appealing than skeuomorphism, it will give the user much better experience and a completely new interface.
But all this was trending 5 years ago and there can be a lot of better improvements made with iOS 13.
Anisotropism is where a virtual object takes on a different appearance depending on the angle from which you view it. An old-fashioned monitor would be a simple example, where the brightness would fall off dramatically when you viewed the screen at an angle. A reflective object is an even more obvious example.
This is already being used with apple pay card on apple pay app.
Here is a small demonstration By Bob Burrough :