Analysts are predicting that a new 3G iPhone will appear sooner than later based on supply problems at 20 Apple retail stores nationwide. Piper Jaffray’s Gene Munster called a number of Apple stores and found that most had no iPhones in stock. Because the supply lead time for Apple is about seven days, this is highly unusual and either points to supply problems or a 3G iPhone appearing in the next few weeks. Munster does not believe that the new iPhone will be significantly different from the old version and will sell at around $400. Keep in mind that these are all rumors and innuendo and unless Apple is getting much worse at keeping secrets, I’d give this a 70% chance of being true.