Adobe Photoshop version 13.0.4 (Macintosh) Update for CS6 available for download, adds support for Retina HiDpi displays.

"For convenience and reliability, we highly recommend that you apply this update directly from within Photoshop. To do so, choose Help > Updates in Photoshop CS6 and apply all of the updates listed under Adobe Photoshop CS6 in the Adobe Application Manager. The Adobe Photoshop 13.0.4 update enables support for new HiDPI displays on the Macintosh platform for a dramatic improvement in image fidelity and resolution. This update applies to all languages of Adobe Photoshop CS6. To install the Photoshop 13.0.4 update:

Disable all virus protection software.
Ensure that the folder on your hard drive containing Photoshop is named "Adobe Photoshop CS6."
Double-click the "AdobePatchInstaller" application. If the updater reports that it cannot find the application to update, uninstall Photoshop CS6, and then reinstall the application (using the default folder name "Adobe Photoshop CS6"). To uninstall Photoshop, navigate to the "Applications/Utilites/Adobe Installers" folder and run "Uninstall Adobe Photoshop CS6" to remove the original installation of Photoshop. Once the removal is complete, reinstall Photoshop, and then run the updater.
Follow the on-screen instructions."

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