There's nothing unique or interesting about that.The most interesting: they are a new model, it seems, will have less capacity and is cheaper.
Whenever Apple continues to offer the previous model of an iPhone after introducing a new one, the previous model is in the lowest capacity and cheaper than originally priced. In fact, correct me if I'm wrong, but didn't the iPhone 3GS come in 16 GB minimum configurations at launch, and it was only after the iPhone 4 that the 8GB version was released. Which would make this upcoming event a complete repeat of what happened last year.