This is interesting. MacRumors reports that an iOS developer found a new, unknown iPad device showing up in his app analytics. Though that usually means the next version of the iPad, the unknown iPad actually had the same footprint as the current iPad 3—but with the faster processor of the iPhone 5. Hmm...
Here's what MacRumors found:
MacRumors has received word from a developer who has seen evidence of a previously unknown "iPad3,6" device showing up in his app analytics. Most interestingly, the device's processor targets the new ARMv7s architecture that supports the custom A6 system-on-a-chip found in the iPhone 5. This new iPad thus appears to be running either an A6 chip itself or a variation on Apple's custom A6 design.
What's interesting about this news is that there were rumors that Apple was going to update the entire line of iOS products this fall so that every new device will have the new racketeering Lightning connector. That would require an update of the 'new iPad' which was released in March of this year. This unknown iPad would be that updated iPad 3.