boy you guys sure are dreamin...
I get a chuckle from all the talk about how Apple is going spring a radically redesigned iMac on us, when its penchant is to refine existing designs, if not recycle old ones.
The iPhone, which is the cash cow/bread & butter of the company, gets more love than anything else, but the flagship is now a 3-year old design, with a growing wart on the back.
The iPad Pro is relatively new, but the rest of the iPads are Air/Air 2/Mini enclosures with updated guts.
The MacBook Air is even older (2008) than the current thin-edge iMac design (2012). Its intended successor was an ill-conceived failure.
The MacBook Pro has seen regular refinements of the basic unibody design, but taken away features users loved (MagSafe, useful ports), in exchange for those users don't (Butterfly keyboard, Touch Bar, dongles). Progress!
Mac mini -- left to languish for years, and when they finally deign to update it, the 2010 case gets a different color and updated guts.
Mac Pro -- also left to languish, and after being shamed into action, it comes back even more expensive and chi-chi, less like a tool, and more like an object of desire, with a similarly precious monitor and stand to go with it.
Now, the iMac, whose basic design dates back to 2006 in plastic form, or 2007 in aluminium form, could certainly benefit from an updated form. But, the chances are that it won't, or any change that comes its way may not necessarily be well received by users, or considered regressions.
Looking at the preponderance of evidence, the lesson seems to be that unless it's a pocketable in a competitive market like the iPhone, or a wearable like the Watch, or new product categories like the AirPods, Apple's probably going to continue to chart a very conservative course, and if, by some surprise, it doesn't, be careful what you wish for.