As Friday's iPhone 5s and iPhone 5c release approaches, analysts and Apple watchers have been predicting how many of the new iPhones Apple will sell over the launch weekend, and predictions range from 5-8 million units. However, there is some concern about possible iPhone 5s constraints and low pre-orders of the iPhone 5c. Piper Jaffray analyst Gene Munster has said that Apple is likely to sell out of iPhone 5s units this weekend, and believes that the company will sell 3 million iPhone 5cs over the three-day period. See: