The latest code dump of an unreleased iOS 5 firmware reveals new model numbers for the iPhone and iPad. However, there's nothing for the "iPhone on training wheels" device, the iPod touch.
TUAW revealed that inside the USB device profiles of iOS 5 are profiles for two never before seen devices called "iPad3,1" and "iPad3,2." Obviosuly Apple is going to be making more iPads in the future and devices often show up in these profiles many months before they are delivered. However, there was some speculation earlier this year that an enhanced iPad 2 or iPad 3 with a Retina display would be released in time for the holidays.
TUAW notes, the omission of a newer iPod touch would break the yearly iPod touch refresh cycle Apple stuck to for the last four years, occuring in September. But likewise, this would also be the first year an iPhone refresh occurs in the fall, as opposed to the June and July launches of previous generations.
No word was given on whether this will have an impact on refreshes to the rest of Apple's iPod line in September.
The new model numbers hidden in the firmware are "iPad 3,1", "iPad 3,2", "iPhone 4,1", and "iPhone 4,2".
While it's highly unlikely a new generation iPad will appear less than a year following the iPad 2's March launch, one can expect the next iPad to carry a rumoured quad-core A6 chip that is exclusive to the device when it launches sometime in 2012, alongside the iPhone 5.