Here’s Mark Gurman’s post from way back last year. Interesting that iPad 2x icons were already appearing in the documentation…
On Apple’s online developer user-interface documents a section discusses iPad universal applications. This is a universal application for two versions of the iPad. The current version and an alluded to higher resolution version, an iPad with a retina display.
As you can see in the image above, Apple notes “MyIcon~ipad.png” for the standard iPad existing today, and a “higher-resolution variant “MyIcon@2X~ipad.” As you can most likely already tell, Apple here is likely referring to a higher-resolution iPad.
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