Thinner and lighter: that's the general direction of Apple's gizmos. And rumors are swirling that Apple will use technologies in the iPhone 5 that will allow it to be even more svelte. A couple days ago the rumor was the Apple would use a new material called Liquidmetal for the casing on the back. This alloy offers great durability yet is light like plastic. And now the rumor today, via DigiTimes and reported on AppleInsider, is that Apple may use in-cell touch displays.