iSkin has rolled out several new cases for the iPhone 4 and fourth-generation iPod touch. The Solo FX for iPhone 4 is a silicone case featuring a slide-in design, Microban antimicrobial protection, a circular pattern on the rear, and open or push-through access to all buttons, ports, and cameras. It is available in five colors and sells for $35. The Solo vu for iPhone 4 is a hybrid clear polycarbonate and soft-polymer case featuring an open-top, slide-in…