Either which way, after doing some thinking about this,
I've come to the conclusion Apple doesn't have a definite date they're shipping these out...yet. If they did, they would update our shipping status so we would stop harassing their reps about it. They can't do an "estimated" shipping date because if it got pushed back everyone (ie most people, I know some people on here like to present themselves on here like they've never been angry or upset in their entire life) would be up in arms about it.
So, you can draw the conclusion from my above conclusion that something is affecting Apple's certainty about having a definite shipping date... Is it the 4850? Are the i5s/i7s causing too much heat? The screen issues? The Flash problems? Or something else? It's anyone's guess.