The Apple iPhone 5 will be made out of a new liquid metal alloy which should result in a thinner, lighter device which is more resistant to impact damage, if reports by Korean ETNews are to be believed.
Apple aquired the rights to Liquidmetal technologies back in 2010.
The report also claims the new iPhone 5 will be unveiled at Apple's WWDC in June, with a September-October release date, so it might be best to hold off upgrading to an iPhone 4S for the time being at least.