Adobe has just announced support for HiDPI and Retina displays “such as Apple’s redesigned MacBook Pro models.” for Illustrator CS6 customers and is available to all Illustrator CS6 customers, both Creative Cloud members as well as owners of perpetual products.
With this update, customers can see more detail in images, text, and in the Illustrator user interface when working on high-resolution displays, including the new Retina display available on MacBook Pro. The HiDPI feature in Illustrator is currently only available on Mac OS. It is expected to be available in the future on additional operating systems.
To access HiRes/Retina support, open Illustrator CS6 and from the main menu select Help > Updates, and choose Update from the Updates dialog.