Through deductive reasoning, one would say yes. Today is November the 5th, (In the U.S.) which is a Tuesday, Tuesdays are the days that Microsoft updates their store with DLCs and the such. The 5th is 'early' November. (They said it would come in EARLY November) If it was saved till next week, it would be the 12th, although close, it's still pretty much mid November by then.
So, logic would say yes? But what do YOU think? Yeh? Nay? This may very well be a simple sever side update on Rockstar's part, and have nothing to do with Microsoft, and their update schedule. Well, in all matters, we'll know within the next couple of hours if it's on Microsoft's end. (DLCs are pushed out around 4am CST, sometimes coming anywhere from 2-6am CST, and the latest being 9 that I've ever seen.)