Another piece of interesting evidence of a higher-resolution iPad has been exposed by Ars Technica. Looking at web server logs for February, Ars staffers found that the site had been visited by devices running iOS 6. Additionally, some of the devices had a screen resolution matching the alleged specs of the next iPad -- 2048 x 1536 pixels.
The Ars visitors came from Apple; staffers were able to match the device IP address with Apple's corporate IP block. While it is very unlikely that iOS 6 will be announced simultaneously with the new iPad on Wednesday, it appears that Apple is beginning to test early versions of the next mobile OS in-house.
The screenshot (shown above) also show that the iOS 6 devices are running a slightly newer version of WebKit, the layout engine that powers the Safari web browser. Devices running iOS 5.0.1 display a WebKit version number of 534.46, while the iOS 6 devices are displaying 535.8.
We're in agreement with Ars on one point -- iOS 5.1 will most likely be introduced on Wednesday at the Apple event or shortly thereafter, while iOS 6 will arrive in the late summer or early fall on a next-generation iPhone.