The same thing happened to me. I have a rep on line now and I'm being told the date change is an error. I don't buy it...I want to talk to someone in management. Hey, maybe I'll try to get Tim Cook via email ha ha
"Everything is awesome! No delay, you'll get your iMac as promised."
"Yeah the last person told me that, now I see a big decline push."
"I don't see anything wrong with your machine-you'll get it on time"
...to be continued-I still have the rep online
The date has changed. One thing I have learned from this is Apple has no problems lying to their customers.