A cheaper iPhone will still have a 4-inch display

The latest rumor says that a coming cheap iPhone will have a 4-inch display, just as the iPhone 5 has, but it will have shell made of some plastic combined with glassfiber that is only 0.4 - 0.6mm thin. It will be very strong because of the material combination. It will also come in 4-6 different colors (black and white included), same colors as the iPod Touch.

No info on price or availability yet, but maybe we will see it on WWDC in June?