Holy iMac, Batman! Apple upgraded the iMac line with all-new quad-core processors, advanced graphics, the new Thunderbolt I/Otechnology, and FaceTime HD camera to name a few features touted by Apple itself. The two configurations, 21.5 inch and 27 inch models can be purchased "off the shelf" or you can build to order. And all wireless; keyboard, Magic Mouse, and/or Magic Trackpad. Way cool.
Here's a good summary of all the new features from the online Apple Store: http://tinyurl.com/6gucox2