Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
New iMacs Go on Sale Friday, November 30
The 21.5-inch iMac will be available through the Apple Online Store (www.apple.com), Apple’s retail stores and select Apple Authorized Resellers. The 27-inch iMac will be available for order through the Apple Online Store and will begin shipping in December.
Apple resellers have been quoting receipt of shipments over the next few days, but official sales will not begin until Friday. Apple unveiled the redesigned iMac at its October 23 media event, announcing that the 21.5-inch models would ship in November with the 27-inch models following in December.