IvySkin and Noreve St. Tropez have both introduced new cases for the iPhone 4. IvySkin’s iPhone 4 Reception Case (pictured) is a clear polycarbonate case measuring 0.8mm thick on the sides and 0.6mm on the back, with openings for access to all ports, controls, and the camera, and included front and back anti-scratch film protectors. It is available for pre-order now for $15; additionally, all iPhone 4 Reception Case customers will be eligible…