Source: http://www.engadget.com/2013/09/24/apple-updates-imac/
While you would be excused for thinking the iPhone 5s and iPhone 5c were Apple's latest offerings, you'd be wrong. Today, Cupertino has announced that the iMac range has been updated to include new silicon (Haswell) new GPUs and improved WiFi. The entry-level 21.5-inch iMac houses a 2.7GHz quad-core Intel Core i5 with iris Pro graphics, while the top spec version (both sizes) comes with 3.4GHz and NVIDIA GeForce 700 series graphics, plus the option to upgrade to core i7 at 3.5 GHz. That WiFi refresh brings "next gen" 802.11ac, and there's also support for PCIe-based flash storage meaning up to 3TB of Fusion drive, or 1TB SSD. The new models are available today, starting at $1,299 for the 21.5-inch, and $1,499 for the bigger display.