You read it right. It is iPhone 3GS that Apple wants to produce up to 2 million by the end of 2011. According to reliable source, the popularity of this iPhone 3GS is the result of special promotion of AT&T that offer this phone with zero subscription rates. It is a very special deal than the iPhone 4 or 4S.
You can easily get this iPhone 3GS by just spending a few dollars a month meanwhile free with contract. There will be another predicted remarkable sale of iPhone 3GS by early 2012 that the estimated iPhone 3GS sold in the period should be as much as 1.6 million units.