Oddly, the new shell takes steps back from its predecessor in protection. It now offers less coverage for the iPad’s buttons, as well as its top and bottom edges. Whereas the previous version only left a thin line of aluminum exposed along the short ends, this one leaves about 3/8” unprotected on each side. Naturally, you have full access to the headphone port, microphone, Sleep/Wake button and Dock Connector port, while the speaker…