9to5Mac think so. According to them, Apple is preparing to add a new SKU to its 4th generation iPad with Retina Display.
They stress that this is not a completely new iPad, and they believe it will be another model of the 4th generation iPad. They also believe that it will come in both black and white, and in Wi-Fi only and Wi-Fi + Cellular models.
While they are not completely certain that this is in fact a 128 GB iPad, they think this is the case because many developers have been finding references to such a model in both the latest iOS 6.1 developer release and in iTunes 11.
Below are the apparent SKUs that were found on the database of a well-known US retailer. The P101 models are supposedly the Wi-Fi only models in both black and white, and the P103 models are the Wi-Fi + Cellular models, also in black and white.