I think this idea is urban legend. I don't think there's ever been anything official about this. There are some anecdotal reports that some have found availability closer to time, but there's no evidence that this is because Disney has released more fastpasses. The mass release for November was (I think) an anomaly. There's a lot of speculation over what it may mean (if anything), but no answers. I'm not sure the reason for OP's question, but I wouldn't bank on a late release of FPs. I would, for sure, keep checking though. You certainly never know!