DirtyHarry is in fact a troll. Someone else correctly pointed out that Apple top brass made it a point to correct an interview article that implied that the imac refresh would be along in 2013 with the mac pro; saying that only the mac pro would have to wait until 2013. That's more specific information than for almost anything else they release.
So yes, whatever else someone else wants to say about rumors being all right/wrong, that is some "different" data for the mix.
He's actually being a pretty bad troll, if you look at it. He's unabashedly gloating in riling people up, oversimplifying opposing arguments to further entice, etc. Real trolling requires more subtlety.
That's just a dirty rumor you are spreading. In fact, it isn't even that. It's purely baseless speculation.
I've taken the time to argue my points and I've yet to resort to character assassination unlike yourself.
Link please some credible information, in other words from Apple themselves, where they clearly state there will be a 2012 iMac. Oh, wait - you can't because they haven't!