Quad-core Ivy Bridge processors are (Insider, registration required), and dual-core siblings will be ready to ship in the next few months, Intel has said.

The iMac would seem the logical line to get Ivy Bridge first: All models of the desktop now rely on Intel second-generation quad-core chips -- unlike the MacBook families, where some models use dual-core processors -- and the iMac is the longest in the tooth.

May 3, 2011.

If Apple uses WWDC to reveal new iMacs -- or any other systems -- it would be to its advantage if they were preloaded with Mountain Lion, not Lion.

Using the newest operating system would appease customers, some who will complain if Mountain Lion launches just after they purchase a new machine. It would also reduce the company's fulfillment costs if, as expected, Apple announces Mountain Lion's release date at WWDC, then includes any Macs sold subsequently in a free upgrade program.