Every day Apple doesn't update the iMac or Pro, they could be enjoying my beautiful cash.
Apple is not worried, they probably know the company will get your cash eventually. I think part of the reason for the delay is this year Apple released the Iphone 4S, 3rd Generation Ipad, Apple TV and the Macbook Pro Retina, spec upgrades to Macbook Pro (non retina) and the Macbook Airs and Moutain Lion next month. These items are producing a lot of revenue this year. The Imac revenue will go on next year's books. Profit is the name of the game. Profit keeps the shareholders happy. Expect the Imac late this year or 2013. Apple is balancing the books my friend.