A stable of new iPads wasn't all Apple had up its sleeve today. The folks in Cupertino have also been hard at work on a desktop update, and the iMac is the beneficiary. If you'll recall, Apple quietly trotted out a more affordable version of the machine back in June, but this fall's release packs a much bigger punch. With the latest model, the company's all-in-one option gets a boost in the screen department with the addition of a Retina panel. That 27-inch oxide TFT display is what Apple's calling "Retina 5K," touting a 5,120 x 2,880 resolution with 67 percent more pixels than 4K. The added real estate means that you'll be able to do things like edit 4K video in Final Cut Pro X while still having plenty of room for all the tools you'll need. Even with all of that new screen power, the new iMac is said to be 30 percent more energy efficient. The outer edge is also 5mm thick, keeping the trim frame all the way around.