iFrogz has debuted its new lineup of cases for the iPhone 4. The eight-case lineup includes the silicone Treadz and Wrapz for $15, the polycarbonate Luxe Lean and TPU SoftGloss with rear etched pattern for $20, and four cases priced at $30—the Fusion, made from polycarbonate with a faux leather insert, the Frosted Swerve, a TPU case with a radial pattern on the rear, the polycarbonate Luxe Original, and the anti-dust treated Luxe Transition.…