iPads Sporting Retina Displays and running iOS 6 have been spotted in web server logs of ArsTechinca. This comes directly from ArsTechinca, The site found 346 visits from a Device with Screen Resolution of 2048×1536. This does not mean that the device used was an iPad with retina display but there are only a handful of devices with that resolution.
This triggered ArsTechinca to look further and deeper, the site started looking to see if any of these visitors were from Apple directly.
We began looking at iPad user agents coming from Apple’s corporate IP block in Cupertino and discovered that Apple appears to be surfing the Web using iPads running what looks like iOS 6.0. The whole listing shows iPads running iOS 5, iOS 5.0.1 (the current public release), iOS 5.1 (the upcoming release currently available to developers), and iOS 6. The iPads that appear to be running iOS 6 are also using a slightly newer build of WebKit-the older OSes all show WebKit 534.46, while the ones claiming to be iOS 6 show WebKit build 535.8.