Tucked within Apple’s iPhone 3.0 beta firmware are hardware strings that mention not one but two unreleased iPhone models as well as similar changes in store for the iPod touch.

An exploration of device strings by the same source that correctly leaked MMS and tethering ahead of Apple’s iPhone 3.0 preview event now finds that there are at least four and as many as six new devices in the pipeline that would share OS X iPhone as their foundation.