As noted by AppleInsider, a number of third-party Mac retailers have recently began to experience limited supply of the 27-inch iMac online and in-stores. Most notably, consumer electronics retailer Best Buy notes that the 27-inch iMac is simply “not available” on its website. These type of supply constraints on Apple products usually foreshadow an upcoming product refresh, especially since the iMac is long due for an update. Apple updated the MacBook Air, MacBook Pro and Mac Pro lineup of computers at WWDC 2012 this year, but neglected to update its all-in-one desktop computer.
Rumors and speculation suggest that when Apple does update the iMac, it will gain faster Intel Ivy Bridge processors and a high resolution Retina display. One rumor specifically states that Apple will release a Retina display iMac in October. On the contrary, it has also been said that Apple might neglect to update the iMac with a Retina display — at least in the near future — because of the difficulties involved with large 21.5-inch and 27-inch screen sizes. Apple last updated the iMac in May 2011 with Thunderbolt, faster graphics and quad-core Intel processors.