So, you've been waiting for a Mophie Juice Pack for your iPhone 4? You're not alone. Well, we have word that it'll be available as soon as next week for $79. We even managed to get hands on with a prototype that looked and felt pretty tight considering the fact that it doubles the iPhone's non-removable battery. The Juice Pack Air features pass-through USB charging and sync with iTunes, an integrated 4 LED charge status, and a standby switch the shuts off the juice turning the appendage into a rather attractive (albeit, heavy with a 1500mAh capacity battery), soft-grip case. Now you know.