Yes I am going to wait and keep using my crappy HP EliteBook 8740w until the new iMac release happens.
I've been using Windows PCs since 1995, but the halo effect of my ipod, iphone and ipad convinced me in March to make the change,
I let myself be swept along by the rumors and convinced myself the update just had to happen at WWDC and so suffered the let down badly (though I suspect not as badly as those looking for a MP update).
I am so impatient to start using OSX I suspect I'll get a MBP if the iMac isn't refreshed with ML (I'll be happy with the CPU and GPU upgrades and care not a jot about retina or a redesign). But then I'll still get the iMac when it is finally released... though after all of that my credit card is going to need a fire extinguisher.
I find myself in the curious position of being a born again Mac fan who is still using Windows (albeit reluctantly).