Apple is about to complete an important part of the puzzle for the new iPad's world rollout: it just confirmed that its Retina display-packing tablet will reach mainland China on July 20th. The company isn't specific about local pricing, but it's promising both WiFi and cellular versions at its own stores and through resellers. The company is keen to avoid some of the mobs and scalping it's seen in the past and will open reservations for pickup starting on July 19th -- although the company is unusually limiting the reservation window to just three hours each day. No matter how it shakes out, the official Chinese expansion is likely to keep the number of
