Incase has unveiled its new Slider Case and Snap Case for the iPhone 4. As in the past, the Slider Case features openings for all ports and controls, as well as a slide-off bottom piece for easy docking. The Slider Case is now available for $35 in Black, and will be available soon in metallic Dark Mauve, Gunmetal, Raspberry, and White. The Snap Case is a low-profile case that snaps around the iPhone 4 and is part of the iPhone 4 Case Program; it will…