New photos claiming to show a silicone case for the next-generation iPhone and a lighter, cheaper iPhone 4 prototype have appeared online. 9 to 5 Mac reports that the case photos point to complete redesign for Apple’s next-generation handset, with a thinner profile than the iPhone 4, and a slightly curved back reminiscent of the fourth-generation iPod touch. Notably, the case photos match a similar purported iPhone 5 case photo sent to iLounge…