First of all...they told you right off the bat that they'd be expecting shipping around November 30th...why anyone expects it to be earlier, I don't understand...in fact, the fact that they've been able to ship out this early is awesome.
Secondly, the reasoning is that they open up pre-orders so that they can get a baseline for what's going to be popular and what's not, this helps them decide how much of what to ship, after a couple of weeks (since, like you, most people place their orders once pre-orders being) they make their order, then production can really grow. Then the company who makes outerwear has to finish production, and ship it, then it has to go through customs (which can take days...or even weeks, like LDC last year). The smaller orders get finished quicker so they get shipped first, while the more popular items take longer and ship later. So that's why it takes so long. Or, at least that's what I understand (I don't know Saga's situation personally, but this is what most companies work with, especially those who do pre-orders like this).
Just be patient, you can wear last years outerwear for a week or two until your items get to you.