Apple developers test-driving the latest Mountain Lion (10.8) release may have noticed some higher-res graphics erroneously popping up in “unexpected places,” such as the double-size phone icon that appears alongside an audio chat invitation in Messages. One such dev reported his findings to Ars Technica, as you can see evidenced in the graphic above. This mild slip-up could imply that Apple plans to release Macs with high-density displays later this year, or, at the very least, that Mountain Lion will beRetina-ready. High-res support dates back to OS X Lion, which is reportedly equipped to play nice with HiDPI displays, should they eventually become available. Compatible icons are but a second piece of the puzzle, which could be completed to the tune of deliciously dense 2880 x 1800 (or higher) resolution 15-inch LCDs. Wouldn’t you love to see that.