Apple may not begin shipping the new iMac until early 2013, according to the French site MacBidouille [Google Translate]. When the new lighter, thinner iMac was introduced three weeks ago, Apple said the 21.5" model would ship by the end of November, with the 27" model shipping by year-end.
During Apple's most recent earnings call, Tim Cook talked briefly about the constraints the company faces during the all-important holiday quarter:
In terms of general shortages on the iMac, we'll be constrained for the full quarter in a significant way, part of that is that we're beginning shipping the 21.5-inch iMac in November and the 27-inch in December. And so there will be a short amount of time during the quarter to manufacture and ramp those and I expect the demand to be robust. So we will have a significant shortage there.
Article Link: New iMac Deliveries to Be Delayed Until Early Next Year?