Inside the Magic isn't even exactly right about when DLR normally films. DLR normally films before Veterans Day on the first weekend in Nov., but maybe they were just trying to say that DLR usually films in November.
In any case, the only reason I can think of for this sort of delay in filming - which never happens - is that something out of ordinary is going to be happening in DLR at that point, that wouldn't be happening on the usual pre-Veterans Day weekend, and ABC wants to capture it. Season of the Force, perhaps? Maybe they want to get some footage if it for the show? Maybe Disney is going to surprise us with something else?
By the way, it is worth mentioning that this year's Winter RaverDay takes place on the weekend of 12/12 and 12/13 -
https://www.facebook.com/events/1407419249587372/. People may recall that when RaverDay coincided with Candlelight weekend and the influx of guests from the nearby pharmacy convention last year,
Disneyland was insanely busy. I suspect that the RaverDay folks probably wanted to avoid those crowds and moved their event to 12/12 -12/14 this year.
It looks like "Mele Kalikimaka Day 2015" is taking place on December 13th as well -
http://unofficialparkdays.com/event/mele-kalikimaka-day-2015/?instance_id=207.
So, why do I have a feeling that that specific December weekend is now destined to be a madhouse?