The rumored white iPhone 4s model made an appearance in AT&T's internal system along with a list of current iPhone models.
According to AppleInsider, an informant sent the alleged screenshot to Engadget. However, there are two oddities in the list. First, the list made no mention of the storage capacity of the iPhone 4s. Second, the "s" is uncapitalized, which is different from the capitalized "G" in iPhone 3G.
While there is no way to confirm the authenticity of the screenshot, it seems to fall in line with what Case Mate disclosed on its website that Apple might be launching two models, the iPhone 5 and a iPhone 4S model. We will only know whether these reports are true in the coming weeks.