Bowers & Wilkins has posted a preview page for its upcoming P5 Mobile Hi-Fi Headphones for the iPod and iPhone. Although details on the new personal listening device are few, the preview page does reveal that the P5s will feature a natural sound signature, a closed-back design with rigid metal faceplates and sealed earpads made from New Zealand sheep’s leather, passive noise isolation, and an in-line iPod- and iPhone-compatible remote and…