Oh, bull. If this is true, then Apple marketing is totally inept at sales forecasting.
This is an intentional marketing ploy, intended to build the buzz and get more media space about how great the iPhone5 is. It's all geared toward making people salivate over this phone and instilling a sense of urgency in them to go buy it. Marketing 101, people.
This nonsense from Apple about underestimating initial demand for products is REAL tiresome.
Even more tiresome? Conspiracy theories.