Incase has introduced two new leather cases for the iPhone 4 and iPhone 4S. The Leather Snap Case is a hardshell snap-on case that features a premium leather exterior colored with semi-transparent aniline dyes to preserve the unique characteristics of the leather and allow the case to develop a unique patina over time. It is available in two colors and sells for $50. The Leather Snapshot Clutch is a folio-style case, featuring an integrated hardshell…