The new elements include the pointing-finger cursor in Safari, the "grabby hand" in Mail, and the camera cursor for taking screenshots and a few others. One straightforward reason for the change could be that Apple wanted to improve the look of the Universal Access zoom feature. But, reports from some Mac Mini users outputting to HDTVs over HDMI that upgrading to 10.7.3 caused their system to reboot into HiDPI mode have added to the mounting evidence that Apple is planning for high-definition Mac displays.
Apple added HiDPI modes to Mac OS X Lion last year, but they were previously only accessible by installing Xcode. HiDPI is modeled after the UI resolution doubling that takes place on Retina Display iPhones.
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Gruber went on to wonder "whether we may be on the cusp of Apple releasing HiDPI Mac displays and/or HiDPI MacBooks. I.e.: retina display Macs." He did, however, add that he has been anticipating "super-high-resolution Mac displays" for over five years, so his speculation should be taken with "a grain of wishful-thinking salt."
Late last year, a rumor emerged that Apple was preparing new versions of its MacBook Pro lineup with double the resolution. The resulting display for a 15-inch MacBook Pro would be 2,880 by 1,800 pixels and is expected to set off "a new round of competition for panel specifications."
Chipmaker Intel has indicated that its next-generation Ivy Bridge processors will support resolutions up to 4K, or 4,096 by 4,096 pixels per monitor. Multiple reports have suggested that the company will launch its Ivy Bridge Processors in the second quarter of 2012, and Apple is expected to begin adding Ivy Bridge chips to its Macs in soon after. Wallpapers as large as 3,200 by 2,000 pixels were also discovered in a developer preview of Mac OS X Lion last year.