If nothing happens tomorrow (suprise with all things on the Applestore, on inivation), I am very doubtful that it will be an update this fall. It was two weeks ago that EDU date changed to 14 days, so it will probably be reversed in the near future. And when you do not hear a word from Apple or any rumors, I consider it as a very small risk that something really happens.
Not a word in rumors (last was for eight days ago, yeah!) or Apple. Apple does not usually tell you things, but something should be labeled if there is still such a major update on the way - right?
The big problem is how to do now for me - I do not want to buy the current iMac as it was not affordable for five cents. You are an idiot if you buy such a machine today with the performance and for the price. Ugh.
It leans almost to a Psystar Corporation for my way - which seems to have both OS X and best hardware in the computer, something that Apple apparently does not fix.
Sorry, Apple.